staging: r8188eu: don't restart "no link" blinking unnecessarily

Simplify one of the cases in rtw_led_control. If we're already blinking
because we have no link, we don't have to restart this blinking when the
caller requests it again. We can simply return and keep on blinking.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220822201329.95559-2-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>