ch: Create ch num_queues based on actual fd size

The tapfdSize element of the vm's private data will always have the
correct number of queue pairs in use for the network even when queues
were not specified so use that data to set num_queues.

Author: bryteise

src/ch/ch_monitor.c

@@ -405,7 +405,7 @@ virCHMonitorBuildNetJson(virDomainObjPtr vm, virJSONValuePtr nets, virDomainNetD
                 goto cleanup;
         }
     }
-    if (netdef->driver.virtio.queues) {
+    if (priv->tapfdSize) {
         if (virJSONValueObjectAppendNumberInt(net, "num_queues", 2 * priv->tapfdSize) < 0)
             goto cleanup;
     }