staging: r8188eu: remove unused variable from rtw_init_drv_sw

Remove unused variable from rtw_init_drv_sw function in
os_dep/os_intfs.c

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210810235047.177883-7-phil@philpotter.co.uk


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