network: Fix segfault on daemon reload

We will segfault of a daemon reload picks up a new network config
that needs to be autostarted. We shouldn't be passing NULL for
network_driver here. This seems like it was missed in the larger
rework in commit 1009a61e

src/network/bridge_driver.c

@@ -769,7 +769,7 @@ networkStateReload(void)
     networkRefreshDaemons(network_driver);
     virNetworkObjListForEach(network_driver->networks,
                              networkAutostartConfig,
-                             NULL);
+                             network_driver);
     return 0;
 }