inetpeer: Make inet_getpeer() take an inet_peer_adress_t pointer.

And make an inet_getpeer_v4() helper, update callers.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ec2333f..3843c2d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1289,7 +1289,7 @@
 {
 	struct inet_peer *peer;
 
-	peer = inet_getpeer(rt->rt_dst, create);
+	peer = inet_getpeer_v4(rt->rt_dst, create);
 
 	if (peer && cmpxchg(&rt->peer, NULL, peer) != NULL)
 		inet_putpeer(peer);