[SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iph

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index b6ac0e2..cb8cf5b 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -145,7 +145,7 @@
 #if RSVP_DST_LEN == 4
 	struct ipv6hdr *nhptr = skb->nh.ipv6h;
 #else
-	struct iphdr *nhptr = skb->nh.iph;
+	struct iphdr *nhptr = ip_hdr(skb);
 #endif
 
 restart: