[ARP]: Minus one level of indentation in arp_req_set

The ATF_PUBL requests are handled completely separate from
the others. Emphasize it with a separate function. This also
reduces the indentation level.

The same issue exists with the arp_delete_request, but
when I tried to make it in one patch diff produced completely
unreadable patch. So I split it into two, but they may be
done with one commit.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/arp.c

@@ -952,18 +952,16 @@ out_of_mem:
  *	Set (create) an ARP cache entry.
  */
 
-static int arp_req_set(struct arpreq *r, struct net_device * dev)
+static int arp_req_set_public(struct arpreq *r, struct net_device *dev)
 {
-	__be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr;
-	struct neighbour *neigh;
-	int err;
+	__be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
+	__be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr;
 
-	if (r->arp_flags&ATF_PUBL) {
-		__be32 mask = ((struct sockaddr_in *) &r->arp_netmask)->sin_addr.s_addr;
 	if (mask && mask != htonl(0xFFFFFFFF))
 		return -EINVAL;
 	if (!dev && (r->arp_flags & ATF_COM)) {
-			dev = dev_getbyhwaddr(&init_net, r->arp_ha.sa_family, r->arp_ha.sa_data);
+		dev = dev_getbyhwaddr(&init_net, r->arp_ha.sa_family,
+				r->arp_ha.sa_data);
 		if (!dev)
 			return -ENODEV;
 	}
@@ -981,8 +979,18 @@ static int arp_req_set(struct arpreq *r, struct net_device * dev)
 		return 0;
 	}
 	return -ENXIO;
-	}
+}
 
+static int arp_req_set(struct arpreq *r, struct net_device * dev)
+{
+	__be32 ip;
+	struct neighbour *neigh;
+	int err;
+
+	if (r->arp_flags & ATF_PUBL)
+		return arp_req_set_public(r, dev);
+
+	ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
 	if (r->arp_flags & ATF_PERM)
 		r->arp_flags |= ATF_COM;
 	if (dev == NULL) {