ipmr: change the prototype of ip_mr_forward().

This patch changes the prototpye of the ip_mr_forward() method to return void
instead of int.

The ip_mr_forward() method always returns 0; moreover, the return value of this
method is not checked anywhere.
Signed-off-by: Rami Rosen <ramirose@gmail.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ipmr.c

@@ -127,7 +127,7 @@ static struct kmem_cache *mrt_cachep __read_mostly;
 static struct mr_table *ipmr_new_table(struct net *net, u32 id);
 static void ipmr_free_table(struct mr_table *mrt);
 
-static int ip_mr_forward(struct net *net, struct mr_table *mrt,
+static void ip_mr_forward(struct net *net, struct mr_table *mrt,
 			  struct sk_buff *skb, struct mfc_cache *cache,
 			  int local);
 static int ipmr_cache_report(struct mr_table *mrt,
@@ -1795,7 +1795,7 @@ static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
 
 /* "local" means that we should preserve one skb (for local delivery) */
 
-static int ip_mr_forward(struct net *net, struct mr_table *mrt,
+static void ip_mr_forward(struct net *net, struct mr_table *mrt,
 			  struct sk_buff *skb, struct mfc_cache *cache,
 			  int local)
 {
@@ -1903,14 +1903,13 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
 				ipmr_queue_xmit(net, mrt, skb2, cache, psend);
 		} else {
 			ipmr_queue_xmit(net, mrt, skb, cache, psend);
-			return 0;
+			return;
 		}
 	}
 
 dont_forward:
 	if (!local)
 		kfree_skb(skb);
-	return 0;
 }
 
 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)