mac802154: remove unnecessary if statement

Removes unnecessary if statement check for net device. Error check performed
after alloc_netdev().

	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
			    NET_NAME_UNKNOWN, ieee802154_if_setup);
        if (!ndev)
                return ERR_PTR(-ENOMEM);
	..
Signed-off-by: Varka Bhadram <varkab@cdac.in>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/mac802154/iface.c

@@ -510,11 +510,9 @@ ieee802154_if_add(struct ieee802154_local *local, const char *name,
 	if (ret)
 		goto err;
 
-	if (ndev) {
 	ret = register_netdevice(ndev);
 	if (ret < 0)
 		goto err;
-	}
 
 	mutex_lock(&local->iflist_mtx);
 	list_add_tail_rcu(&sdata->list, &local->interfaces);