[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/core/netpoll.c b/net/core/netpoll.c
index b4d1cdd..44e030e 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -308,7 +308,9 @@
 	if (udph->check == 0)
 		udph->check = CSUM_MANGLED_0;
 
-	skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
+	skb_push(skb, sizeof(*iph));
+	skb_reset_network_header(skb);
+	iph = skb->nh.iph;
 
 	/* iph->version = 4; iph->ihl = 5; */
 	put_unaligned(0x45, (unsigned char *)iph);