staging: rtl8723bs: remove redundant initialization

The variable ret is being initialized as 0 and is never used until
it's updated by sdio_register_driver()

This removes the redundant initialization of ret

Signed-off-by: Bryan Brattlof <hello@bryanbrattlof.com>
Link: https://lore.kernel.org/r/20210409201235.407671-1-hello@bryanbrattlof.com


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