virNetworkObjDispose: Don't leak virMacMap object

Even though the virMacMap object is not necessarily created at
the same time as the network object, the former makes no sense
without the latter and thus should be unref'd in the network
object dispose function.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/network_conf.c

@@ -443,6 +443,7 @@ virNetworkObjDispose(void *obj)
     virNetworkDefFree(net->def);
     virNetworkDefFree(net->newDef);
     virBitmapFree(net->class_id);
+    virObjectUnref(net->macmap);
 }
 
 static void