[SK_BUFF]: Use skb_reset_network_header where the return of __pskb_pull was being used

It returns skb->data, so we can just use skb_reset_network_header after it.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index f84ca66..7c6fda6 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -617,7 +617,8 @@
 		}
 
 		skb_reset_mac_header(skb);
-		skb->nh.raw = __pskb_pull(skb, offset);
+		__pskb_pull(skb, offset);
+		skb_reset_network_header(skb);
 		skb_postpull_rcsum(skb, skb->h.raw, offset);
 		skb->pkt_type = PACKET_HOST;
 #ifdef CONFIG_NET_IPGRE_BROADCAST