[ARP]: Remove overkill checks from neigh_param_alloc.

Valid network device is always passed into neigh_param_alloc, so
remove extra checking for dev == NULL. Additionally, cleanup bogus
netns assignment.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/neighbour.c

@@ -1291,10 +1291,7 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
 	struct neigh_parms *p, *ref;
 	struct net *net;
 
-	net = &init_net;
-	if (dev)
 	net = dev->nd_net;
-
 	ref = lookup_neigh_params(tbl, net, 0);
 	if (!ref)
 		return NULL;
@@ -1306,7 +1303,7 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
 		INIT_RCU_HEAD(&p->rcu_head);
 		p->reachable_time =
 				neigh_rand_reach_time(p->base_reachable_time);
-		if (dev) {
+
 		if (dev->neigh_setup && dev->neigh_setup(dev, p)) {
 			kfree(p);
 			return NULL;
@@ -1314,7 +1311,6 @@ struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
 
 		dev_hold(dev);
 		p->dev = dev;
-		}
 		p->net = hold_net(net);
 		p->sysctl_table = NULL;
 		write_lock_bh(&tbl->lock);