staging: rtl8723bs: Removed unneeded variables

coccicheck reported warning for unneeded variable used.

This patch removes the unneeded variables.

Signed-off-by: Aliasgar Surti <aliasgar.surti500@gmail.com>
Link: https://lore.kernel.org/r/1568798749-9855-1-git-send-email-aliasgar.surti500@gmail.com


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