net: Abstract dst->neighbour accesses behind helpers.

dst_{get,set}_neighbour()

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 1cca576..07bf108 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -677,7 +677,7 @@
 		struct neighbour *neigh = NULL;
 
 		if (skb_dst(skb))
-			neigh = skb_dst(skb)->neighbour;
+			neigh = dst_get_neighbour(skb_dst(skb));
 
 		if (neigh == NULL) {
 			if (net_ratelimit())
@@ -702,7 +702,7 @@
 		struct neighbour *neigh = NULL;
 
 		if (skb_dst(skb))
-			neigh = skb_dst(skb)->neighbour;
+			neigh = dst_get_neighbour(skb_dst(skb));
 
 		if (neigh == NULL) {
 			if (net_ratelimit())