network: check newDef for used bridge names in addition to def

If someone has updated a network to change its bridge name, but the
network is still active (so that bridge name hasn't taken effect yet),
we still want to disallow another network from taking that new name.

src/conf/network_conf.c

@@ -3270,15 +3270,22 @@ virNetworkBridgeInUseHelper(const void *payload,
                             const void *name ATTRIBUTE_UNUSED,
                             const void *opaque)
 {
-    int ret = 0;
+    int ret;
     virNetworkObjPtr net = (virNetworkObjPtr) payload;
     const struct virNetworkBridgeInUseHelperData *data = opaque;
 
     virObjectLock(net);
-    if (net->def->bridge &&
-        STREQ(net->def->bridge, data->bridge) &&
-        !(data->skipname && STREQ(net->def->name, data->skipname)))
+    if (data->skipname &&
+        ((net->def && STREQ(net->def->name, data->skipname)) ||
+         (net->newDef && STREQ(net->newDef->name, data->skipname))))
+        ret = 0;
+    else if ((net->def && net->def->bridge &&
+              STREQ(net->def->bridge, data->bridge)) ||
+             (net->newDef && net->newDef->bridge &&
+              STREQ(net->newDef->bridge, data->bridge)))
         ret = 1;
+    else
+        ret = 0;
     virObjectUnlock(net);
     return ret;
 }