staging: rtl8723bs: Remove initialisation of globals to 0

This fixes the following checkpatch.pl errors:

    ERROR: do not initialise globals to {0,NULL}

Signed-off-by: Scott J. Crouch <scottjcrouch@gmail.com>
Link: https://lore.kernel.org/r/20210804001335.16742-1-scottjcrouch@gmail.com


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