net: ipv4: ip_input: fix blank line coding style issues

Fix blank line coding style issues, make the code cleaner.
Remove a redundant blank line in ip_rcv_core().
Insert a blank line in ip_rcv() between different statement blocks.
Signed-off-by: NYang Wei <yang.wei9@zte.com.cn>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ip_input.c

@@ -429,7 +429,6 @@ static struct sk_buff *ip_rcv_core(struct sk_buff *skb, struct net *net)
 	if (skb->pkt_type == PACKET_OTHERHOST)
 		goto drop;
 
-
 	__IP_UPD_PO_STATS(net, IPSTATS_MIB_IN, skb->len);
 
 	skb = skb_share_check(skb, GFP_ATOMIC);
@@ -521,6 +520,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 	skb = ip_rcv_core(skb, net);
 	if (skb == NULL)
 		return NET_RX_DROP;
+
 	return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING,
 		       net, NULL, skb, dev, NULL,
 		       ip_rcv_finish);