staging: rtl8723bs: os_dep: Remove unnecessary variable used in return statement

Remove the variable that is used only in return statement and return the
expression itself. Issue found using coccinelle.

Signed-off-by: Nachammai Karuppiah <nachukannan@gmail.com>
Link: https://lore.kernel.org/r/1572929483-78993-1-git-send-email-nachukannan@gmail.com


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