netdev_WARN_ONCE is broken (whoops..), this fix will remove the
unnecessary "condition" parameter, add the missing comma and change
"arg" to "args".

Fixes: 375ef2b1 ("net: Introduce netdev_*_once functions")
Signed-off-by: NGal Pressman <galp@mellanox.com>
Reviewed-by: NSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>