[SK_BUFF]: Use skb_reset_network_header in skb_push cases

skb_push updates and returns skb->data, so we can just call
skb_reset_network_header after the call to skb_push.

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_output.c b/net/ipv4/ip_output.c
index 32f1a23..d329718 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -503,7 +503,8 @@
 			if (frag) {
 				frag->ip_summed = CHECKSUM_NONE;
 				frag->h.raw = frag->data;
-				frag->nh.raw = __skb_push(frag, hlen);
+				__skb_push(frag, hlen);
+				skb_reset_network_header(frag);
 				memcpy(frag->nh.raw, iph, hlen);
 				iph = frag->nh.iph;
 				iph->tot_len = htons(frag->len);