net: Add extack to ndo_add_slave

Pass extack to do_set_master and down to ndo_add_slave

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 05fcaba..368a506 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1246,7 +1246,8 @@ struct net_device_ops {
 						     u32 flow_id);
 #endif
 	int			(*ndo_add_slave)(struct net_device *dev,
-						 struct net_device *slave_dev);
+						 struct net_device *slave_dev,
+						 struct netlink_ext_ack *extack);
 	int			(*ndo_del_slave)(struct net_device *dev,
 						 struct net_device *slave_dev);
 	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,