batman-adv: add iface_disable() callback to routing API

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index ca8f395..a47a6ce 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -209,6 +209,7 @@
 
 	/* all algorithms must implement all ops (for now) */
 	if (!bat_algo_ops->bat_iface_enable ||
+	    !bat_algo_ops->bat_iface_disable ||
 	    !bat_algo_ops->bat_ogm_init_primary ||
 	    !bat_algo_ops->bat_ogm_update_mac ||
 	    !bat_algo_ops->bat_ogm_schedule ||