net/mlx5: add missing void argument to function mlx5_devlink_alloc

Function mlx5_devlink_alloc is missing a void argument, add it
to clean up the non-ANSI function declaration.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/devlink.c

@@ -37,7 +37,7 @@ static const struct devlink_ops mlx5_devlink_ops = {
 	.flash_update = mlx5_devlink_flash_update,
 };
 
-struct devlink *mlx5_devlink_alloc()
+struct devlink *mlx5_devlink_alloc(void)
 {
 	return devlink_alloc(&mlx5_devlink_ops, sizeof(struct mlx5_core_dev));
 }