qeth: layer 3 do not allow to change mac address

hw does not allow to change the mac address.
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/s390/net/qeth_l3_main.c

@@ -2961,6 +2961,7 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
 	card->dev->vlan_rx_add_vid = qeth_l3_vlan_rx_add_vid;
 	card->dev->vlan_rx_kill_vid = qeth_l3_vlan_rx_kill_vid;
 	card->dev->mtu = card->info.initial_mtu;
+	card->dev->set_mac_address = NULL;
 	SET_ETHTOOL_OPS(card->dev, &qeth_l3_ethtool_ops);
 	card->dev->features |=	NETIF_F_HW_VLAN_TX |
 				NETIF_F_HW_VLAN_RX |