Use error_is_set() only when necessary

error_is_set(&var) is the same as var != NULL, but it takes
whole-program analysis to figure that out.  Unnecessarily hard for
optimizers, static checkers, and human readers.  Dumb it down to
obvious.

Gets rid of several dozen Coverity false positives.

Note that the obvious form is already used in many places.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

37 files changed, 156 insertions, 156 deletions

diff --git a/block.c b/block.c
index 636aa117c3..53a9b1ffed 100644
--- a/block.c
+++ b/block.c
@@ -421,7 +421,7 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
     assert(cco->drv);
 
     ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(&cco->err, local_err);
     }
     cco->ret = ret;
@@ -460,7 +460,7 @@ int bdrv_create(BlockDriver *drv, const char* filename,
 
     ret = cco.ret;
     if (ret < 0) {
-        if (error_is_set(&cco.err)) {
+        if (cco.err) {
             error_propagate(errp, cco.err);
         } else {
             error_setg_errno(errp, -ret, "Could not create image");
@@ -486,7 +486,7 @@ int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
     }
 
     ret = bdrv_create(drv, filename, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
@@ -909,7 +909,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
     }
 
     if (ret < 0) {
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
         } else if (bs->filename[0]) {
             error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename);
@@ -1031,7 +1031,7 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
     /* Parse the filename and open it */
     if (drv->bdrv_parse_filename && filename) {
         drv->bdrv_parse_filename(filename, options, &local_err);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
             ret = -EINVAL;
             goto fail;
@@ -1400,7 +1400,7 @@ fail:
     QDECREF(bs->options);
     QDECREF(options);
     bs->options = NULL;
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
@@ -1408,7 +1408,7 @@ fail:
 close_and_fail:
     bdrv_close(bs);
     QDECREF(options);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
@@ -5338,7 +5338,7 @@ out:
     free_option_parameters(create_options);
     free_option_parameters(param);
 
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
 }
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 8eb0db0723..ee10013362 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -303,7 +303,7 @@ static int read_config(BDRVBlkdebugState *s, const char *filename,
     }
 
     qemu_config_parse_qdict(options, config_groups, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto fail;
@@ -393,7 +393,7 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto out;
diff --git a/block/blkverify.c b/block/blkverify.c
index cfcbcf41c3..1563c88324 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -128,7 +128,7 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto fail;
diff --git a/block/curl.c b/block/curl.c
index a8075847b8..bb1fc4ae28 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -463,7 +463,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         goto out_noclean;
diff --git a/block/gluster.c b/block/gluster.c
index a009b15ded..58eab07829 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -282,7 +282,7 @@ static int qemu_gluster_open(BlockDriverState *bs,  QDict *options,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         ret = -EINVAL;
diff --git a/block/iscsi.c b/block/iscsi.c
index 8d0f9667c5..0a4ec3a63f 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1123,7 +1123,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         ret = -EINVAL;
diff --git a/block/nbd.c b/block/nbd.c
index 327e913002..abae506f04 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -209,7 +209,7 @@ static int nbd_config(BDRVNBDState *s, QDict *options, char **export)
                                       &error_abort);
 
     qemu_opts_absorb_qdict(s->socket_opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -EINVAL;
diff --git a/block/qapi.c b/block/qapi.c
index 8f4134b40a..8f2b4dbe7d 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -271,7 +271,7 @@ void bdrv_query_info(BlockDriverState *bs,
         p_image_info = &info->inserted->image;
         while (1) {
             bdrv_query_image_info(bs0, p_image_info, &local_err);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 error_propagate(errp, local_err);
                 goto err;
             }
@@ -336,7 +336,7 @@ BlockInfoList *qmp_query_block(Error **errp)
      while ((bs = bdrv_next(bs))) {
         BlockInfoList *info = g_malloc0(sizeof(*info));
         bdrv_query_info(bs, &info->value, &local_err);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
             goto err;
         }
diff --git a/block/qcow2.c b/block/qcow2.c
index 0b4335ca5b..b1dbdb120e 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -671,7 +671,7 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
     /* Enable lazy_refcounts according to image and command line options */
     opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto fail;
@@ -1605,7 +1605,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
     ret = bdrv_open(bs, filename, NULL,
                     BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING,
                     drv, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         goto out;
     }
@@ -1685,7 +1685,7 @@ static int qcow2_create(const char *filename, QEMUOptionParameter *options,
 
     ret = qcow2_create2(filename, sectors, backing_file, backing_fmt, flags,
                         cluster_size, prealloc, options, version, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 126a634e45..161ea14812 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -361,7 +361,7 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
 
     opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto fail;
@@ -448,7 +448,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 
     s->type = FTYPE_FILE;
     ret = raw_open_common(bs, options, flags, 0, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
@@ -1597,7 +1597,7 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
 
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (ret < 0) {
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
         }
         return ret;
@@ -1832,7 +1832,7 @@ static int floppy_open(BlockDriverState *bs, QDict *options, int flags,
     /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
     ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
     if (ret) {
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
         }
         return ret;
@@ -1961,7 +1961,7 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
 
     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
     ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
@@ -2078,7 +2078,7 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
 
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (ret) {
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
         }
         return ret;
diff --git a/block/raw-win32.c b/block/raw-win32.c
index beb7f2395e..ae1c8e6cca 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -279,7 +279,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto fail;
@@ -594,7 +594,7 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
     QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
                                       &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
         goto done;
diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index af8706dc97..01ea692a46 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -146,7 +146,7 @@ static int raw_create(const char *filename, QEMUOptionParameter *options,
     int ret;
 
     ret = bdrv_create_file(filename, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
     return ret;
diff --git a/block/rbd.c b/block/rbd.c
index 121fae221e..dbc79f4525 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -440,7 +440,7 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         qemu_opts_del(opts);
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 672b9c97a2..e6c0376566 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1385,7 +1385,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         ret = -EINVAL;
diff --git a/block/snapshot.c b/block/snapshot.c
index 9047f8ddc9..85c52ff455 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -345,7 +345,7 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
         ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err);
     }
 
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
     }
 
diff --git a/block/vvfat.c b/block/vvfat.c
index 664941c560..a19e4ca227 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1085,7 +1085,7 @@ DLOG(if (stderr == NULL) {
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         ret = -EINVAL;
diff --git a/blockdev.c b/blockdev.c
index 36ceece9ff..be05a581a0 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -331,13 +331,13 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
      * stay in bs_opts for processing by bdrv_open(). */
     id = qdict_get_try_str(bs_opts, "id");
     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
-    if (error_is_set(&error)) {
+    if (error) {
         error_propagate(errp, error);
         return NULL;
     }
 
     qemu_opts_absorb_qdict(opts, bs_opts, &error);
-    if (error_is_set(&error)) {
+    if (error) {
         error_propagate(errp, error);
         goto early_err;
     }
@@ -443,7 +443,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
         }
 
         on_write_error = parse_block_error_action(buf, 0, &error);
-        if (error_is_set(&error)) {
+        if (error) {
             error_propagate(errp, error);
             goto early_err;
         }
@@ -457,7 +457,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
         }
 
         on_read_error = parse_block_error_action(buf, 1, &error);
-        if (error_is_set(&error)) {
+        if (error) {
             error_propagate(errp, error);
             goto early_err;
         }
@@ -688,7 +688,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
     legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
                                    &error_abort);
     qemu_opts_absorb_qdict(legacy_opts, bs_opts, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         goto fail;
@@ -875,13 +875,13 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
     /* Actual block device init: Functionality shared with blockdev-add */
     dinfo = blockdev_init(filename, bs_opts, type, &local_err);
     if (dinfo == NULL) {
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             qerror_report_err(local_err);
             error_free(local_err);
         }
         goto fail;
     } else {
-        assert(!error_is_set(&local_err));
+        assert(!local_err);
     }
 
     /* Set legacy DriveInfo fields */
@@ -1017,7 +1017,7 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
     }
 
     ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return NULL;
     }
@@ -1030,7 +1030,7 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
     }
 
     bdrv_snapshot_delete(bs, id, name, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return NULL;
     }
@@ -1244,7 +1244,7 @@ static void external_snapshot_prepare(BlkTransactionState *common,
     state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
                                    has_node_name ? node_name : NULL,
                                    &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -1289,7 +1289,7 @@ static void external_snapshot_prepare(BlkTransactionState *common,
                         state->old_bs->filename,
                         state->old_bs->drv->format_name,
                         NULL, -1, flags, &local_err, false);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
             return;
         }
@@ -1360,7 +1360,7 @@ static void drive_backup_prepare(BlkTransactionState *common, Error **errp)
                      backup->has_on_source_error, backup->on_source_error,
                      backup->has_on_target_error, backup->on_target_error,
                      &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         state->bs = NULL;
         state->job = NULL;
@@ -1452,7 +1452,7 @@ void qmp_transaction(TransactionActionList *dev_list, Error **errp)
         QSIMPLEQ_INSERT_TAIL(&snap_bdrv_states, state, entry);
 
         state->ops->prepare(state, &local_err);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
             goto delete_and_fail;
         }
@@ -1533,7 +1533,7 @@ void qmp_block_passwd(bool has_device, const char *device,
     bs = bdrv_lookup_bs(has_device ? device : NULL,
                         has_node_name ? node_name : NULL,
                         &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -1598,7 +1598,7 @@ void qmp_change_blockdev(const char *device, const char *filename,
     }
 
     eject_device(bs, 0, &err);
-    if (error_is_set(&err)) {
+    if (err) {
         error_propagate(errp, err);
         return;
     }
@@ -1735,7 +1735,7 @@ void qmp_block_resize(bool has_device, const char *device,
     bs = bdrv_lookup_bs(has_device ? device : NULL,
                         has_node_name ? node_name : NULL,
                         &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -1828,7 +1828,7 @@ void qmp_block_stream(const char *device, bool has_base,
 
     stream_start(bs, base_bs, base, has_speed ? speed : 0,
                  on_error, block_job_cb, bs, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -1986,7 +1986,7 @@ void qmp_drive_backup(const char *device, const char *target,
         }
     }
 
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -2127,7 +2127,7 @@ void qmp_drive_mirror(const char *device, const char *target,
         }
     }
 
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -2266,7 +2266,7 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
 
     visit_type_BlockdevOptions(qmp_output_get_visitor(ov),
                                &options, NULL, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         goto fail;
     }
@@ -2277,7 +2277,7 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
     qdict_flatten(qdict);
 
     blockdev_init(NULL, qdict, IF_NONE, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         goto fail;
     }
diff --git a/blockjob.c b/blockjob.c
index 9e5fd5c162..b3ce14cebd 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -61,7 +61,7 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
         Error *local_err = NULL;
 
         block_job_set_speed(job, speed, &local_err);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             bs->job = NULL;
             g_free(job);
             bdrv_set_in_use(bs, 0);
@@ -92,7 +92,7 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
         return;
     }
     job->driver->set_speed(job, speed, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
diff --git a/hmp.c b/hmp.c
index 081c12145c..e3ddd4654d 100644
--- a/hmp.c
+++ b/hmp.c
@@ -881,7 +881,7 @@ void hmp_balloon(Monitor *mon, const QDict *qdict)
     Error *errp = NULL;
 
     qmp_balloon(value, &errp);
-    if (error_is_set(&errp)) {
+    if (errp) {
         monitor_printf(mon, "balloon: %s\n", error_get_pretty(errp));
         error_free(errp);
     }
@@ -1118,7 +1118,7 @@ void hmp_change(Monitor *mon, const QDict *qdict)
     }
 
     qmp_change(device, target, !!arg, arg, &err);
-    if (error_is_set(&err) &&
+    if (err &&
         error_get_class(err) == ERROR_CLASS_DEVICE_ENCRYPTED) {
         error_free(err);
         monitor_read_block_device_key(mon, device, NULL, NULL);
@@ -1336,12 +1336,12 @@ void hmp_netdev_add(Monitor *mon, const QDict *qdict)
     QemuOpts *opts;
 
     opts = qemu_opts_from_qdict(qemu_find_opts("netdev"), qdict, &err);
-    if (error_is_set(&err)) {
+    if (err) {
         goto out;
     }
 
     netdev_add(opts, &err);
-    if (error_is_set(&err)) {
+    if (err) {
         qemu_opts_del(opts);
     }
 
diff --git a/hw/pci/pci-hotplug-old.c b/hw/pci/pci-hotplug-old.c
index 8dbc3c1cab..cf2caebfb1 100644
--- a/hw/pci/pci-hotplug-old.c
+++ b/hw/pci/pci-hotplug-old.c
@@ -90,7 +90,7 @@ static PCIDevice *qemu_pci_hot_add_nic(Monitor *mon,
     qemu_opt_set(opts, "type", "nic");
 
     ret = net_client_init(opts, 0, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return NULL;
@@ -322,7 +322,7 @@ static int pci_device_hot_remove(Monitor *mon, const char *pci_addr)
     }
 
     qdev_unplug(&d->qdev, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         monitor_printf(mon, "%s\n", error_get_pretty(local_err));
         error_free(local_err);
         return -1;
diff --git a/hw/usb/dev-network.c b/hw/usb/dev-network.c
index 4c532b7d6a..f0c253647e 100644
--- a/hw/usb/dev-network.c
+++ b/hw/usb/dev-network.c
@@ -1391,7 +1391,7 @@ static USBDevice *usb_net_init(USBBus *bus, const char *cmdline)
     qemu_opt_set(opts, "model", "usb");
 
     idx = net_client_init(opts, 0, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return NULL;
diff --git a/net/net.c b/net/net.c
index 2c3af202a6..41b38830ea 100644
--- a/net/net.c
+++ b/net/net.c
@@ -882,7 +882,7 @@ void net_host_device_add(Monitor *mon, const QDict *qdict)
     qemu_opt_set(opts, "type", device);
 
     net_client_init(opts, 0, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         monitor_printf(mon, "adding host network device %s failed\n", device);
@@ -918,17 +918,17 @@ int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
     QemuOpts *opts;
 
     opts_list = qemu_find_opts_err("netdev", &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         goto exit_err;
     }
 
     opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         goto exit_err;
     }
 
     netdev_add(opts, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qemu_opts_del(opts);
         goto exit_err;
     }
@@ -1152,7 +1152,7 @@ static int net_init_client(QemuOpts *opts, void *dummy)
     Error *local_err = NULL;
 
     net_client_init(opts, 0, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -1;
@@ -1167,7 +1167,7 @@ static int net_init_netdev(QemuOpts *opts, void *dummy)
     int ret;
 
     ret = net_client_init(opts, 1, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -1;
diff --git a/qdev-monitor.c b/qdev-monitor.c
index 1d3b68d40a..2d1ef8dac7 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -656,7 +656,7 @@ int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
     DeviceState *dev;
 
     opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -1;
diff --git a/qemu-char.c b/qemu-char.c
index 30c5a6afd0..d0b4ac5ffd 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2725,7 +2725,7 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
 
     chr = qemu_chr_open_socket_fd(fd, do_nodelay, is_listen, is_telnet,
                                   is_waitconnect, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         goto fail;
     }
     return chr;
@@ -2938,7 +2938,7 @@ QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
     Error *local_err = NULL;
 
     opts = qemu_opts_create(qemu_find_opts("chardev"), label, 1, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return NULL;
@@ -3323,7 +3323,7 @@ CharDriverState *qemu_chr_new(const char *label, const char *filename, void (*in
         return NULL;
 
     chr = qemu_chr_new_from_opts(opts, init, &err);
-    if (error_is_set(&err)) {
+    if (err) {
         error_report("%s", error_get_pretty(err));
         error_free(err);
     }
diff --git a/qemu-img.c b/qemu-img.c
index c989850ce7..0927b090de 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -419,7 +419,7 @@ static int img_create(int argc, char **argv)
 
     bdrv_img_create(filename, fmt, base_filename, base_fmt,
                     options, img_size, BDRV_O_FLAGS, &local_err, quiet);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_report("%s: %s", filename, error_get_pretty(local_err));
         error_free(local_err);
         return 1;
@@ -1289,7 +1289,7 @@ static int img_convert(int argc, char **argv)
 
         bdrv_snapshot_load_tmp_by_id_or_name(bs[0], snapshot_name, &local_err);
     }
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_report("Failed to load snapshot: %s",
                      error_get_pretty(local_err));
         error_free(local_err);
@@ -1775,7 +1775,7 @@ static ImageInfoList *collect_image_info_list(const char *filename,
         }
 
         bdrv_query_image_info(bs, &info, &err);
-        if (error_is_set(&err)) {
+        if (err) {
             error_report("%s", error_get_pretty(err));
             error_free(err);
             goto err;
@@ -2184,7 +2184,7 @@ static int img_snapshot(int argc, char **argv)
 
     case SNAPSHOT_DELETE:
         bdrv_snapshot_delete_by_id_or_name(bs, snapshot_name, &err);
-        if (error_is_set(&err)) {
+        if (err) {
             error_report("Could not delete snapshot '%s': (%s)",
                          snapshot_name, error_get_pretty(err));
             error_free(err);
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 8100bee67e..cae41716ca 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -108,7 +108,7 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
     }
 
     ga_wait_child(pid, &status, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         return;
     }
@@ -181,7 +181,7 @@ void qmp_guest_set_time(int64_t time_ns, Error **errp)
     }
 
     ga_wait_child(pid, &status, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
@@ -669,7 +669,7 @@ static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **err)
     }
 
     ga_wait_child(pid, &status, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         return;
     }
@@ -713,14 +713,14 @@ int64_t qmp_guest_fsfreeze_freeze(Error **err)
     slog("guest-fsfreeze called");
 
     execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         return -1;
     }
 
     QTAILQ_INIT(&mounts);
     build_fs_mount_list(&mounts, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         return -1;
     }
@@ -780,7 +780,7 @@ int64_t qmp_guest_fsfreeze_thaw(Error **err)
 
     QTAILQ_INIT(&mounts);
     build_fs_mount_list(&mounts, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         return 0;
     }
@@ -861,7 +861,7 @@ void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)
 
     QTAILQ_INIT(&mounts);
     build_fs_mount_list(&mounts, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         return;
     }
@@ -957,7 +957,7 @@ static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
     }
 
     ga_wait_child(pid, &status, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         goto out;
     }
@@ -1034,7 +1034,7 @@ static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
     }
 
     ga_wait_child(pid, &status, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(err, local_err);
         goto out;
     }
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index a6a0af264b..50094ddfd3 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -197,7 +197,7 @@ int64_t qmp_guest_fsfreeze_freeze(Error **err)
 
 error:
     qmp_guest_fsfreeze_thaw(&local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         g_debug("cleanup thaw: %s", error_get_pretty(local_err));
         error_free(local_err);
     }
diff --git a/savevm.c b/savevm.c
index a7dbe18a67..7329fc58de 100644
--- a/savevm.c
+++ b/savevm.c
@@ -880,7 +880,7 @@ static int del_existing_snapshots(Monitor *mon, const char *name)
         if (bdrv_can_snapshot(bs) &&
             bdrv_snapshot_find(bs, snapshot, name) >= 0) {
             bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
-            if (error_is_set(&err)) {
+            if (err) {
                 monitor_printf(mon,
                                "Error while deleting snapshot on device '%s':"
                                " %s\n",
@@ -1115,7 +1115,7 @@ void do_delvm(Monitor *mon, const QDict *qdict)
     while ((bs1 = bdrv_next(bs1))) {
         if (bdrv_can_snapshot(bs1)) {
             bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
-            if (error_is_set(&err)) {
+            if (err) {
                 monitor_printf(mon,
                                "Error while deleting snapshot on device '%s':"
                                " %s\n",
diff --git a/tests/test-qmp-input-strict.c b/tests/test-qmp-input-strict.c
index 6f68963a3d..38bdf5ec7c 100644
--- a/tests/test-qmp-input-strict.c
+++ b/tests/test-qmp-input-strict.c
@@ -92,7 +92,7 @@ static void test_validate_struct(TestInputVisitorData *data,
     v = validate_test_init(data, "{ 'integer': -42, 'boolean': true, 'string': 'foo' }");
 
     visit_type_TestStruct(v, &p, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_free(p->string);
     g_free(p);
 }
@@ -107,7 +107,7 @@ static void test_validate_struct_nested(TestInputVisitorData *data,
     v = validate_test_init(data, "{ 'string0': 'string0', 'dict1': { 'string1': 'string1', 'dict2': { 'userdef1': { 'integer': 42, 'string': 'string' }, 'string2': 'string2'}}}");
 
     visit_type_UserDefNested(v, &udp, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     qapi_free_UserDefNested(udp);
 }
 
@@ -121,7 +121,7 @@ static void test_validate_list(TestInputVisitorData *data,
     v = validate_test_init(data, "[ { 'string': 'string0', 'integer': 42 }, { 'string': 'string1', 'integer': 43 }, { 'string': 'string2', 'integer': 44 } ]");
 
     visit_type_UserDefOneList(v, &head, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     qapi_free_UserDefOneList(head);
 }
 
@@ -135,7 +135,7 @@ static void test_validate_union(TestInputVisitorData *data,
     v = validate_test_init(data, "{ 'type': 'b', 'data' : { 'integer': 42 } }");
 
     visit_type_UserDefUnion(v, &tmp, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     qapi_free_UserDefUnion(tmp);
 }
 
@@ -149,7 +149,7 @@ static void test_validate_fail_struct(TestInputVisitorData *data,
     v = validate_test_init(data, "{ 'integer': -42, 'boolean': true, 'string': 'foo', 'extra': 42 }");
 
     visit_type_TestStruct(v, &p, NULL, &errp);
-    g_assert(error_is_set(&errp));
+    g_assert(errp);
     if (p) {
         g_free(p->string);
     }
@@ -166,7 +166,7 @@ static void test_validate_fail_struct_nested(TestInputVisitorData *data,
     v = validate_test_init(data, "{ 'string0': 'string0', 'dict1': { 'string1': 'string1', 'dict2': { 'userdef1': { 'integer': 42, 'string': 'string', 'extra': [42, 23, {'foo':'bar'}] }, 'string2': 'string2'}}}");
 
     visit_type_UserDefNested(v, &udp, NULL, &errp);
-    g_assert(error_is_set(&errp));
+    g_assert(errp);
     qapi_free_UserDefNested(udp);
 }
 
@@ -180,7 +180,7 @@ static void test_validate_fail_list(TestInputVisitorData *data,
     v = validate_test_init(data, "[ { 'string': 'string0', 'integer': 42 }, { 'string': 'string1', 'integer': 43 }, { 'string': 'string2', 'integer': 44, 'extra': 'ggg' } ]");
 
     visit_type_UserDefOneList(v, &head, NULL, &errp);
-    g_assert(error_is_set(&errp));
+    g_assert(errp);
     qapi_free_UserDefOneList(head);
 }
 
@@ -194,7 +194,7 @@ static void test_validate_fail_union(TestInputVisitorData *data,
     v = validate_test_init(data, "{ 'type': 'b', 'data' : { 'integer': 42 }, 'extra': 'yyy' }");
 
     visit_type_UserDefUnion(v, &tmp, NULL, &errp);
-    g_assert(error_is_set(&errp));
+    g_assert(errp);
     qapi_free_UserDefUnion(tmp);
 }
 
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index 1e1c6fa0c2..6eb7dc5bcf 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -96,7 +96,7 @@ static void test_visitor_in_int(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "%" PRId64, value);
 
     visit_type_int(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, value);
 }
 
@@ -114,7 +114,7 @@ static void test_visitor_in_int_overflow(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "%f", DBL_MAX);
 
     visit_type_int(v, &res, NULL, &errp);
-    g_assert(error_is_set(&errp));
+    g_assert(errp);
     error_free(errp);
 }
 
@@ -128,7 +128,7 @@ static void test_visitor_in_bool(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "true");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, true);
 }
 
@@ -142,7 +142,7 @@ static void test_visitor_in_number(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "%f", value);
 
     visit_type_number(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpfloat(res, ==, value);
 }
 
@@ -156,7 +156,7 @@ static void test_visitor_in_string(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "%s", value);
 
     visit_type_str(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpstr(res, ==, value);
 
     g_free(res);
@@ -175,7 +175,7 @@ static void test_visitor_in_enum(TestInputVisitorData *data,
         v = visitor_input_test_init(data, "%s", EnumOne_lookup[i]);
 
         visit_type_EnumOne(v, &res, NULL, &errp);
-        g_assert(!error_is_set(&errp));
+        g_assert(!errp);
         g_assert_cmpint(i, ==, res);
 
         visitor_input_teardown(data, NULL);
@@ -223,7 +223,7 @@ static void test_visitor_in_struct(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "{ 'integer': -42, 'boolean': true, 'string': 'foo' }");
 
     visit_type_TestStruct(v, &p, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(p->integer, ==, -42);
     g_assert(p->boolean == true);
     g_assert_cmpstr(p->string, ==, "foo");
@@ -248,7 +248,7 @@ static void test_visitor_in_struct_nested(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "{ 'string0': 'string0', 'dict1': { 'string1': 'string1', 'dict2': { 'userdef1': { 'integer': 42, 'string': 'string' }, 'string2': 'string2'}}}");
 
     visit_type_UserDefNested(v, &udp, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
 
     check_and_free_str(udp->string0, "string0");
     check_and_free_str(udp->dict1.string1, "string1");
@@ -272,7 +272,7 @@ static void test_visitor_in_list(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "[ { 'string': 'string0', 'integer': 42 }, { 'string': 'string1', 'integer': 43 }, { 'string': 'string2', 'integer': 44 } ]");
 
     visit_type_UserDefOneList(v, &head, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert(head != NULL);
 
     for (i = 0, item = head; item; item = item->next, i++) {
@@ -601,7 +601,7 @@ static void test_visitor_in_errors(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "{ 'integer': false, 'boolean': 'foo', 'string': -42 }");
 
     visit_type_TestStruct(v, &p, NULL, &errp);
-    g_assert(error_is_set(&errp));
+    g_assert(errp);
     g_assert(p->string == NULL);
 
     error_free(errp);
diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index e073d833bf..f31d168d63 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -49,7 +49,7 @@ static void test_visitor_out_int(TestOutputVisitorData *data,
     QObject *obj;
 
     visit_type_int(data->ov, &value, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -67,7 +67,7 @@ static void test_visitor_out_bool(TestOutputVisitorData *data,
     QObject *obj;
 
     visit_type_bool(data->ov, &value, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -85,7 +85,7 @@ static void test_visitor_out_number(TestOutputVisitorData *data,
     QObject *obj;
 
     visit_type_number(data->ov, &value, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -103,7 +103,7 @@ static void test_visitor_out_string(TestOutputVisitorData *data,
     QObject *obj;
 
     visit_type_str(data->ov, &string, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -122,7 +122,7 @@ static void test_visitor_out_no_string(TestOutputVisitorData *data,
 
     /* A null string should return "" */
     visit_type_str(data->ov, &string, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -141,7 +141,7 @@ static void test_visitor_out_enum(TestOutputVisitorData *data,
 
     for (i = 0; i < ENUM_ONE_MAX; i++) {
         visit_type_EnumOne(data->ov, &i, "unused", &errp);
-        g_assert(!error_is_set(&errp));
+        g_assert(!errp);
 
         obj = qmp_output_get_qobject(data->qov);
         g_assert(obj != NULL);
@@ -161,7 +161,7 @@ static void test_visitor_out_enum_errors(TestOutputVisitorData *data,
     for (i = 0; i < ARRAY_SIZE(bad_values) ; i++) {
         errp = NULL;
         visit_type_EnumOne(data->ov, &bad_values[i], "unused", &errp);
-        g_assert(error_is_set(&errp) == true);
+        g_assert(errp);
         error_free(errp);
     }
 }
@@ -198,7 +198,7 @@ static void test_visitor_out_struct(TestOutputVisitorData *data,
     QDict *qdict;
 
     visit_type_TestStruct(data->ov, &p, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -241,7 +241,7 @@ static void test_visitor_out_struct_nested(TestOutputVisitorData *data,
     ud2->dict1.dict3.string3 = g_strdup(strings[3]);
 
     visit_type_UserDefNested(data->ov, &ud2, "unused", &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
@@ -288,7 +288,7 @@ static void test_visitor_out_struct_errors(TestOutputVisitorData *data,
         u.has_enum1 = true;
         u.enum1 = bad_values[i];
         visit_type_UserDefOne(data->ov, &pu, "unused", &errp);
-        g_assert(error_is_set(&errp) == true);
+        g_assert(errp);
         error_free(errp);
     }
 }
@@ -343,7 +343,7 @@ static void test_visitor_out_list(TestOutputVisitorData *data,
     }
 
     visit_type_TestStructList(data->ov, &head, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
 
     obj = qmp_output_get_qobject(data->qov);
     g_assert(obj != NULL);
diff --git a/tests/test-string-input-visitor.c b/tests/test-string-input-visitor.c
index 5989f8118e..d406263aee 100644
--- a/tests/test-string-input-visitor.c
+++ b/tests/test-string-input-visitor.c
@@ -60,7 +60,7 @@ static void test_visitor_in_int(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "-42");
 
     visit_type_int(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, value);
 }
 
@@ -74,42 +74,42 @@ static void test_visitor_in_bool(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "true");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, true);
     visitor_input_teardown(data, unused);
 
     v = visitor_input_test_init(data, "yes");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, true);
     visitor_input_teardown(data, unused);
 
     v = visitor_input_test_init(data, "on");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, true);
     visitor_input_teardown(data, unused);
 
     v = visitor_input_test_init(data, "false");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, false);
     visitor_input_teardown(data, unused);
 
     v = visitor_input_test_init(data, "no");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, false);
     visitor_input_teardown(data, unused);
 
     v = visitor_input_test_init(data, "off");
 
     visit_type_bool(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpint(res, ==, false);
 }
 
@@ -123,7 +123,7 @@ static void test_visitor_in_number(TestInputVisitorData *data,
     v = visitor_input_test_init(data, "3.14");
 
     visit_type_number(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpfloat(res, ==, value);
 }
 
@@ -137,7 +137,7 @@ static void test_visitor_in_string(TestInputVisitorData *data,
     v = visitor_input_test_init(data, value);
 
     visit_type_str(v, &res, NULL, &errp);
-    g_assert(!error_is_set(&errp));
+    g_assert(!errp);
     g_assert_cmpstr(res, ==, value);
 
     g_free(res);
@@ -156,7 +156,7 @@ static void test_visitor_in_enum(TestInputVisitorData *data,
         v = visitor_input_test_init(data, EnumOne_lookup[i]);
 
         visit_type_EnumOne(v, &res, NULL, &errp);
-        g_assert(!error_is_set(&errp));
+        g_assert(!errp);
         g_assert_cmpint(i, ==, res);
 
         visitor_input_teardown(data, NULL);
diff --git a/tests/test-string-output-visitor.c b/tests/test-string-output-visitor.c
index 79d815f888..52231cd4b8 100644
--- a/tests/test-string-output-visitor.c
+++ b/tests/test-string-output-visitor.c
@@ -49,7 +49,7 @@ static void test_visitor_out_int(TestOutputVisitorData *data,
     char *str;
 
     visit_type_int(data->ov, &value, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     str = string_output_get_string(data->sov);
     g_assert(str != NULL);
@@ -65,7 +65,7 @@ static void test_visitor_out_bool(TestOutputVisitorData *data,
     char *str;
 
     visit_type_bool(data->ov, &value, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     str = string_output_get_string(data->sov);
     g_assert(str != NULL);
@@ -81,7 +81,7 @@ static void test_visitor_out_number(TestOutputVisitorData *data,
     char *str;
 
     visit_type_number(data->ov, &value, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     str = string_output_get_string(data->sov);
     g_assert(str != NULL);
@@ -97,7 +97,7 @@ static void test_visitor_out_string(TestOutputVisitorData *data,
     char *str;
 
     visit_type_str(data->ov, &string, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     str = string_output_get_string(data->sov);
     g_assert(str != NULL);
@@ -114,7 +114,7 @@ static void test_visitor_out_no_string(TestOutputVisitorData *data,
 
     /* A null string should return "" */
     visit_type_str(data->ov, &string, NULL, &errp);
-    g_assert(error_is_set(&errp) == 0);
+    g_assert(!errp);
 
     str = string_output_get_string(data->sov);
     g_assert(str != NULL);
@@ -131,7 +131,7 @@ static void test_visitor_out_enum(TestOutputVisitorData *data,
 
     for (i = 0; i < ENUM_ONE_MAX; i++) {
         visit_type_EnumOne(data->ov, &i, "unused", &errp);
-        g_assert(!error_is_set(&errp));
+        g_assert(!errp);
 
         str = string_output_get_string(data->sov);
         g_assert(str != NULL);
@@ -149,7 +149,7 @@ static void test_visitor_out_enum_errors(TestOutputVisitorData *data,
     for (i = 0; i < ARRAY_SIZE(bad_values) ; i++) {
         errp = NULL;
         visit_type_EnumOne(data->ov, &bad_values[i], "unused", &errp);
-        g_assert(error_is_set(&errp) == true);
+        g_assert(errp);
         error_free(errp);
     }
 }
diff --git a/tpm.c b/tpm.c
index d68d69fe39..c371023b1c 100644
--- a/tpm.c
+++ b/tpm.c
@@ -161,7 +161,7 @@ static int configure_tpm(QemuOpts *opts)
 
     /* validate backend specific opts */
     qemu_opts_validate(opts, be->opts, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return 1;
diff --git a/util/qemu-config.c b/util/qemu-config.c
index 9298f55ecf..797df71569 100644
--- a/util/qemu-config.c
+++ b/util/qemu-config.c
@@ -31,7 +31,7 @@ QemuOptsList *qemu_find_opts(const char *group)
     Error *local_err = NULL;
 
     ret = find_list(vm_config_groups, group, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_report("%s", error_get_pretty(local_err));
         error_free(local_err);
     }
@@ -295,7 +295,7 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
         if (sscanf(line, "[%63s \"%63[^\"]\"]", group, id) == 2) {
             /* group with id */
             list = find_list(lists, group, &local_err);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 error_report("%s", error_get_pretty(local_err));
                 error_free(local_err);
                 goto out;
@@ -306,7 +306,7 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname)
         if (sscanf(line, "[%63[^]]]", group) == 1) {
             /* group without id */
             list = find_list(lists, group, &local_err);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 error_report("%s", error_get_pretty(local_err));
                 error_free(local_err);
                 goto out;
@@ -376,13 +376,13 @@ static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
     }
 
     subopts = qemu_opts_create(opts, NULL, 0, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         goto out;
     }
 
     qemu_opts_absorb_qdict(subopts, subqdict, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         goto out;
     }
@@ -416,13 +416,13 @@ static void config_parse_qdict_section(QDict *options, QemuOptsList *opts,
             opt_name = g_strdup_printf("%s.%u", opts->name, i++);
             subopts = qemu_opts_create(opts, opt_name, 1, &local_err);
             g_free(opt_name);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 error_propagate(errp, local_err);
                 goto out;
             }
 
             qemu_opts_absorb_qdict(subopts, section, &local_err);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 error_propagate(errp, local_err);
                 qemu_opts_del(subopts);
                 goto out;
@@ -450,7 +450,7 @@ void qemu_config_parse_qdict(QDict *options, QemuOptsList **lists,
 
     for (i = 0; lists[i]; i++) {
         config_parse_qdict_section(options, lists[i], &local_err);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
             return;
         }
diff --git a/util/qemu-option.c b/util/qemu-option.c
index 668e5d919f..fd76cd2ada 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -246,7 +246,7 @@ int set_option_parameter(QEMUOptionParameter *list, const char *name,
     switch (list->type) {
     case OPT_FLAG:
         parse_option_bool(name, value, &flag, &local_err);
-        if (!error_is_set(&local_err)) {
+        if (!local_err) {
             list->value.n = flag;
         }
         break;
@@ -269,7 +269,7 @@ int set_option_parameter(QEMUOptionParameter *list, const char *name,
         return -1;
     }
 
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -1;
@@ -640,7 +640,7 @@ static void opt_set(QemuOpts *opts, const char *name, const char *value,
     opt->desc = desc;
     opt->str = g_strdup(value);
     qemu_opt_parse(opt, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         qemu_opt_del(opt);
     }
@@ -651,7 +651,7 @@ int qemu_opt_set(QemuOpts *opts, const char *name, const char *value)
     Error *local_err = NULL;
 
     opt_set(opts, name, value, false, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -1;
@@ -812,7 +812,7 @@ int qemu_opts_set(QemuOptsList *list, const char *id,
     Error *local_err = NULL;
 
     opts = qemu_opts_create(list, id, 1, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         qerror_report_err(local_err);
         error_free(local_err);
         return -1;
@@ -897,7 +897,7 @@ static int opts_do_parse(QemuOpts *opts, const char *params,
         if (strcmp(option, "id") != 0) {
             /* store and parse */
             opt_set(opts, option, value, prepend, &local_err);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 qerror_report_err(local_err);
                 error_free(local_err);
                 return -1;
@@ -945,7 +945,7 @@ static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
     assert(!defaults || list->merge_lists);
     opts = qemu_opts_create(list, id, !defaults, &local_err);
     if (opts == NULL) {
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             qerror_report_err(local_err);
             error_free(local_err);
         }
@@ -1034,7 +1034,7 @@ QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 
     opts = qemu_opts_create(list, qdict_get_try_str(qdict, "id"), 1,
                             &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         return NULL;
     }
@@ -1044,7 +1044,7 @@ QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
     state.errp = &local_err;
     state.opts = opts;
     qdict_iter(qdict, qemu_opts_from_qdict_1, &state);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_propagate(errp, local_err);
         qemu_opts_del(opts);
         return NULL;
@@ -1075,7 +1075,7 @@ void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
 
         if (find_desc_by_name(opts->list->desc, entry->key)) {
             qemu_opts_from_qdict_1(entry->key, entry->value, &state);
-            if (error_is_set(&local_err)) {
+            if (local_err) {
                 error_propagate(errp, local_err);
                 return;
             } else {
@@ -1129,7 +1129,7 @@ void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
         }
 
         qemu_opt_parse(opt, &local_err);
-        if (error_is_set(&local_err)) {
+        if (local_err) {
             error_propagate(errp, local_err);
             return;
         }
diff --git a/vl.c b/vl.c
index a7b00cdd37..934a615b57 100644
--- a/vl.c
+++ b/vl.c
@@ -2321,7 +2321,7 @@ static int chardev_init_func(QemuOpts *opts, void *opaque)
     Error *local_err = NULL;
 
     qemu_chr_new_from_opts(opts, NULL, &local_err);
-    if (error_is_set(&local_err)) {
+    if (local_err) {
         error_report("%s", error_get_pretty(local_err));
         error_free(local_err);
         return -1;