[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/ndisc.c b/net/ipv6/ndisc.c
index 00feb4c..8b946f5 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1366,7 +1366,7 @@
 		return;
 	}
 
-	icmph = (struct icmp6hdr *) skb->h.raw;
+	icmph = icmp6_hdr(skb);
 	target = (struct in6_addr *) (icmph + 1);
 	dest = target + 1;