qemu-option: Use returned bool to check for failure

The previous commit enables conversion of

    foo(..., &err);
    if (err) {
        ...
    }

to

    if (!foo(..., &err)) {
        ...
    }

for QemuOpts functions that now return true / false on success /
error.  Coccinelle script:

    @@
    identifier fun = {
        opts_do_parse, parse_option_bool, parse_option_number,
        parse_option_size, qemu_opt_parse, qemu_opt_rename, qemu_opt_set,
        qemu_opt_set_bool, qemu_opt_set_number, qemu_opts_absorb_qdict,
        qemu_opts_do_parse, qemu_opts_from_qdict_entry, qemu_opts_set,
        qemu_opts_validate
    };
    expression list args, args2;
    typedef Error;
    Error *err;
    @@
    -    fun(args, &err, args2);
    -    if (err)
    +    if (!fun(args, &err, args2))
         {
             ...
         }

A few line breaks tidied up manually.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200707160613.848843-15-armbru@redhat.com>
[Conflict with commit 0b6786a9c1 "block/amend: refactor qcow2 amend
options" resolved by rerunning Coccinelle on master's version]

1 files changed, 2 insertions, 2 deletions

diff --git a/contrib/ivshmem-server/main.c b/contrib/ivshmem-server/main.c
index e4cd35f74c..ee08c4ced0 100644
--- a/contrib/ivshmem-server/main.c
+++ b/contrib/ivshmem-server/main.c
@@ -103,8 +103,8 @@ ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
             break;
 
         case 'l': /* shm size */
-            parse_option_size("shm_size", optarg, &args->shm_size, &err);
-            if (err) {
+            if (!parse_option_size("shm_size", optarg, &args->shm_size,
+                                   &err)) {
                 error_report_err(err);
                 ivshmem_server_help(argv[0]);
                 exit(1);