Avoid compile warnings about assignment/conditional/truthvalue

ChangeLog

+Wed Apr 22 15:28:03 BST 2009 Daniel P. Berrange <berrange@redhat.com>
+
+	* src/network_driver.c: Explicit check for NULL, to avoid
+	compiler complaining about "assignment treated as truth value
+	in conditional".
+
 Wed Apr 22 15:27:03 BST 2009 Daniel P. Berrange <berrange@redhat.com>
 
 	Use private /dev/pts instance for containers (needs 'newinstance'

src/network_conf.c

@@ -748,7 +748,7 @@ virNetworkObjPtr virNetworkLoadConfig(virConnectPtr conn,
     /* Generate a bridge if none is found, but don't check for collisions
      * if a bridge is hardcoded, so the network is at least defined
      */
-    if (tmp = virNetworkAllocateBridge(conn, nets, def->bridge)) {
+    if ((tmp = virNetworkAllocateBridge(conn, nets, def->bridge)) != NULL) {
         VIR_FREE(def->bridge);
         def->bridge = tmp;
     } else