net: add netlink_ext_ack argument to rtnl_link_ops.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/ipv6/sit.c b/net/ipv6/sit.c
index f7445fd..b800042 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1574,7 +1574,8 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev,
 }
 
 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
-			  struct nlattr *data[])
+			    struct nlattr *data[],
+			    struct netlink_ext_ack *extack)
 {
 	struct ip_tunnel *t = netdev_priv(dev);
 	struct ip_tunnel_parm p;