[SK_BUFF]: Introduce skb_set_network_header

For the cases where the network header is being set to a offset from skb->data.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ax25/ax25_out.c b/net/ax25/ax25_out.c
index 02dea85..e66953c 100644
--- a/net/ax25/ax25_out.c
+++ b/net/ax25/ax25_out.c
@@ -148,7 +148,8 @@
 
 			if (ka9qfrag == 1) {
 				skb_reserve(skbn, frontlen + 2);
-				skbn->nh.raw = skbn->data + skb_network_offset(skb);
+				skb_set_network_header(skbn,
+						      skb_network_offset(skb));
 				memcpy(skb_put(skbn, len), skb->data, len);
 				p = skb_push(skbn, 2);
 
@@ -161,7 +162,8 @@
 				}
 			} else {
 				skb_reserve(skbn, frontlen + 1);
-				skbn->nh.raw = skbn->data + skb_network_offset(skb);
+				skb_set_network_header(skbn,
+						      skb_network_offset(skb));
 				memcpy(skb_put(skbn, len), skb->data, len);
 				p = skb_push(skbn, 1);
 				*p = AX25_P_TEXT;