i4l: minor cleanups

Minor cleanups, either made possible or obvious after commit d700555b (I4l:
convert to net_device_ops).
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/i4l/isdn_net.c

@@ -2515,7 +2515,6 @@ static const struct net_device_ops isdn_netdev_ops = {
 	.ndo_stop	      = isdn_net_close,
 	.ndo_do_ioctl	      = isdn_net_ioctl,
 
-	.ndo_validate_addr    = NULL,
 	.ndo_start_xmit	      = isdn_net_start_xmit,
 	.ndo_get_stats	      = isdn_net_get_stats,
 	.ndo_tx_timeout	      = isdn_net_tx_timeout,
@@ -2530,12 +2529,8 @@ static void _isdn_setup(struct net_device *dev)
 
 	ether_setup(dev);
 
-	dev->flags = IFF_NOARP | IFF_POINTOPOINT;
 	/* Setup the generic properties */
-	dev->mtu = 1500;
 	dev->flags = IFF_NOARP|IFF_POINTOPOINT;
-	dev->type = ARPHRD_ETHER;
-	dev->addr_len = ETH_ALEN;
 	dev->header_ops = NULL;
 	dev->netdev_ops = &isdn_netdev_ops;