admin_server: fix memory leak

If caller of adminConnectListServers() pass NULL instead of servers we
need to free the list we've received from virNetDaemonGetServers().
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

daemon/admin_server.c

@@ -54,6 +54,7 @@ adminConnectListServers(virNetDaemonPtr dmn,
         srvs = NULL;
     }
  cleanup:
+    virObjectListFreeCount(srvs, ret);
     return ret;
 }