[SK_BUFF] xfrm4: use skb_reset_network_header

Setting it to skb->h.raw, which is valid, in the (to become) old pointer based
world order and in the new world of offset based layer headers.
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/xfrm4_mode_transport.c

@@ -50,8 +50,10 @@ static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 {
 	int ihl = skb->data - skb->h.raw;
 
-	if (skb->h.raw != skb->nh.raw)
-		skb->nh.raw = memmove(skb->h.raw, skb->nh.raw, ihl);
+	if (skb->h.raw != skb->nh.raw) {
+		memmove(skb->h.raw, skb->nh.raw, ihl);
+		skb->nh.raw = skb->h.raw;
+	}
 	skb->nh.iph->tot_len = htons(skb->len + ihl);
 	skb->h.raw = skb->data;
 	return 0;