net: add netlink_ext_ack argument to rtnl_link_ops.slave_changelink

Add support for extended error reporting.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 9af177c..3bc8907 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -897,7 +897,8 @@ static int br_validate(struct nlattr *tb[], struct nlattr *data[],
 static int br_port_slave_changelink(struct net_device *brdev,
 				    struct net_device *dev,
 				    struct nlattr *tb[],
-				    struct nlattr *data[])
+				    struct nlattr *data[],
+				    struct netlink_ext_ack *extack)
 {
 	struct net_bridge *br = netdev_priv(brdev);
 	int ret;