staging: rtl8723bs: uninitialize static variable

ensure static variable is not initialized, per checkpatch

Signed-off-by: Daniel Watson <ozzloy@challenge-bot.com>
Link: https://lore.kernel.org/r/20220612030734.31469-1-ozzloy@challenge-bot.com


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