Staging: rtl8723bs/core: fix space coding style issue

Add one space around (on each side of) '*' binary operators.

Signed-off-by: Qiang Ma <maqianga@uniontech.com>
Link: https://lore.kernel.org/r/20210315015659.2402-1-maqianga@uniontech.com


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