migration: Fix double-free on error path

Fixes: ffaa1b50a8 (migration: Use warn_reportf_err() where appropriate)
Resolves: Coverity CID 1643463
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20251125070554.2256181-1-armbru@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>

migration/multifd.c

@@ -450,7 +450,7 @@ static void multifd_send_set_error(Error *err)
  */
 static void migration_ioc_shutdown_gracefully(QIOChannel *ioc)
 {
-    g_autoptr(Error) local_err = NULL;
+    Error *local_err = NULL;
 
     if (!migration_has_failed(migrate_get_current()) &&
         object_dynamic_cast((Object *)ioc, TYPE_QIO_CHANNEL_TLS)) {