[ARP]: Move inet_addr_type call after simple error checks in arp_contructor.

The neighbour entry will be destroyed in the case of error, so it is
pointless to perform constly routing table lookup in this case.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/arp.c

@@ -235,8 +235,6 @@ static int arp_constructor(struct neighbour *neigh)
 	struct in_device *in_dev;
 	struct neigh_parms *parms;
 
-	neigh->type = inet_addr_type(&init_net, addr);
-
 	rcu_read_lock();
 	in_dev = __in_dev_get_rcu(dev);
 	if (in_dev == NULL) {
@@ -244,6 +242,8 @@ static int arp_constructor(struct neighbour *neigh)
 		return -EINVAL;
 	}
 
+	neigh->type = inet_addr_type(&init_net, addr);
+
 	parms = in_dev->arp_parms;
 	__neigh_parms_put(neigh->parms);
 	neigh->parms = neigh_parms_clone(parms);