[ICMP6]: Introduce icmp6_hdr()

For consistency with all the other skb->h.raw accessors.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index f429290..feba6b1 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -209,7 +209,7 @@
 		     __be16 port, u32 info, u8 *payload)
 {
 	struct ipv6_pinfo *np  = inet6_sk(sk);
-	struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
+	struct icmp6hdr *icmph = icmp6_hdr(skb);
 	struct sock_exterr_skb *serr;
 
 	if (!np->recverr)