Simplify net_dbg_ratelimited() dummy

There is no need to wrap calls to the no_printk() helper inside an
always-false check, as no_printk() already does that internally.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>