qapi: More complex uses of QAPI_LIST_APPEND

These cases require a bit more thought to review; in each case, the
code was appending to a list, but not with a FOOList **tail variable.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210113221013.390592-6-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Flawed change to qmp_guest_network_get_interfaces() dropped]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 2 insertions, 11 deletions

diff --git a/net/net.c b/net/net.c
index 2afac24b79..fb7b7dcc25 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1213,10 +1213,9 @@ RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
                                       Error **errp)
 {
     NetClientState *nc;
-    RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
+    RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
 
     QTAILQ_FOREACH(nc, &net_clients, next) {
-        RxFilterInfoList *entry;
         RxFilterInfo *info;
 
         if (has_name && strcmp(nc->name, name) != 0) {
@@ -1241,15 +1240,7 @@ RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
 
         if (nc->info->query_rx_filter) {
             info = nc->info->query_rx_filter(nc);
-            entry = g_malloc0(sizeof(*entry));
-            entry->value = info;
-
-            if (!filter_list) {
-                filter_list = entry;
-            } else {
-                last_entry->next = entry;
-            }
-            last_entry = entry;
+            QAPI_LIST_APPEND(tail, info);
         } else if (has_name) {
             error_setg(errp, "net client(%s) doesn't support"
                        " rx-filter querying", name);