[PATCH v2 1/7 for-5.2?] net: Fix memory leak on error

[Eric Blake <eblake@redhat.com>]

If qmp_query_rx_filter() encounters an error on a second iteration, it
leaks the memory from the first.

Fixes: 9083da1d4c
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 net/net.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/net.c b/net/net.c
index 794c652282cb..eb65e110871a 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1213,6 +1213,7 @@ RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
         if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
             if (has_name) {
                 error_setg(errp, "net client(%s) isn't a NIC", name);
+                qapi_free_RxFilterInfoList(filter_list);
                 return NULL;
             }
             continue;
@@ -1238,6 +1239,7 @@ RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
         } else if (has_name) {
             error_setg(errp, "net client(%s) doesn't support"
                        " rx-filter querying", name);
+            qapi_free_RxFilterInfoList(filter_list);
             return NULL;
         }

-- 
2.28.0