batman-adv: Remove declaration of batman_skb_recv

batman_skb_recv can be defined in hard-interface.c as static because it is
never used outside of that file.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 4f95777..8a9cf7a 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -34,6 +34,12 @@
 /* protect update critical side of if_list - but not the content */
 static DEFINE_SPINLOCK(if_list_lock);
 
+
+static int batman_skb_recv(struct sk_buff *skb,
+			   struct net_device *dev,
+			   struct packet_type *ptype,
+			   struct net_device *orig_dev);
+
 static void hardif_free_rcu(struct rcu_head *rcu)
 {
 	struct batman_if *batman_if;
@@ -549,8 +555,9 @@
 
 /* receive a packet with the batman ethertype coming on a hard
  * interface */
-int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
-	struct packet_type *ptype, struct net_device *orig_dev)
+static int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
+			   struct packet_type *ptype,
+			   struct net_device *orig_dev)
 {
 	struct bat_priv *bat_priv;
 	struct batman_packet *batman_packet;