batman-adv: Convert batadv_bla_claim to kref

batman-adv uses a self-written reference implementation which is just based
on atomic_t. This is less obvious when reading the code than kref and
therefore increases the change that the reference counting will be missed.

Signed-off-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/types.h b/net/batman-adv/types.h
index 595f524..34c13b6 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -951,7 +951,7 @@
 	unsigned long lasttime;
 	struct hlist_node hash_entry;
 	struct rcu_head rcu;
-	atomic_t refcount;
+	struct kref refcount;
 };
 #endif