batman-adv: use to_delayed_work

Use to_delayed_work() instead of open-coding it.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Reviewed-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index e4cbb07..5b802f0 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -1222,7 +1222,7 @@
 	struct delayed_work *delayed_work;
 	struct batadv_priv *bat_priv;
 
-	delayed_work = container_of(work, struct delayed_work, work);
+	delayed_work = to_delayed_work(work);
 	bat_priv = container_of(delayed_work, struct batadv_priv, orig_work);
 	_batadv_purge_orig(bat_priv);
 	queue_delayed_work(batadv_event_workqueue,