bluez: fix invoking parent dispose() function in NMBluezManager

Fixes: bf5a6ad443

src/devices/bluetooth/nm-bluez-manager.c

@@ -397,6 +397,8 @@ dispose (GObject *object)
 	cleanup_checking (self, TRUE);
 
 	priv->bluez_version = 0;
+
+	G_OBJECT_CLASS (nm_bluez_manager_parent_class)->dispose (object);
 }
 
 static void