net: add netlink_ext_ack argument to rtnl_link_ops.newlink

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/drivers/net/veth.c b/drivers/net/veth.c
index 0156fe8..3db907c 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -347,7 +347,8 @@
 static struct rtnl_link_ops veth_link_ops;
 
 static int veth_newlink(struct net *src_net, struct net_device *dev,
-			 struct nlattr *tb[], struct nlattr *data[])
+			struct nlattr *tb[], struct nlattr *data[],
+			struct netlink_ext_ack *extack)
 {
 	int err;
 	struct net_device *peer;