batman-adv: remove old bridge loop avoidance code

The functionality is to be replaced by an improved implementation,
so first clean up.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index b0370e3..71d4211 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -30,6 +30,9 @@
 #include "vis.h"
 #include "unicast.h"
 
+static int route_unicast_packet(struct sk_buff *skb,
+				struct hard_iface *recv_if);
+
 void slide_own_bcast_window(struct hard_iface *hard_iface)
 {
 	struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
@@ -798,7 +801,7 @@
 	return 0;
 }
 
-int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
+static int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if)
 {
 	struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface);
 	struct orig_node *orig_node = NULL;