[SK_BUFF] ipconfig: Another conversion to skb_reset_network_header related to skb_put

boot_pkt->iph is the first member, that is at skb->data, so just use
skb_reset_network_header().
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ipconfig.c

@@ -702,7 +702,8 @@ static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_d
 	memset(b, 0, sizeof(struct bootp_pkt));
 
 	/* Construct IP header */
-	skb->nh.iph = h = &b->iph;
+	skb_reset_network_header(skb);
+	h = skb->nh.iph;
 	h->version = 4;
 	h->ihl = 5;
 	h->tot_len = htons(sizeof(struct bootp_pkt));