staging: rtl8723bs: os_dep: Remove conditions with no effects

Removed conditions with no effects. Detected by Coccinelle.
Deleted a variable that is no longer used because of the above-mentioned
removals.

Reviewed-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20210609132346.15403-1-fmdefrancesco@gmail.com


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