staging: rtl8723bs/core: add spaces between operators

Add spaces between operators for a better readability
in function 'rtw_seccalctkipmic'.

Signed-off-by: Qiang Ma <maqianga@uniontech.com>
Link: https://lore.kernel.org/r/20210316120500.351-1-maqianga@uniontech.com


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