staging: rtl8723bs: hal: sdio_halinit: Remove unused variable 'ret'

staging: rtl8723bs: hal: sdio_halinit: Remove unused variable 'ret'

Fixes the following W=1 kernel build warning(s):

 drivers/staging/rtl8723bs/hal/sdio_halinit.c: In function ‘CardDisableRTL8723BSdio’:
 drivers/staging/rtl8723bs/hal/sdio_halinit.c:881:5: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 drivers/staging/rtl8723bs/hal/sdio_halinit.c: In function ‘CardDisableRTL8723BSdio’:
 drivers/staging/rtl8723bs/hal/sdio_halinit.c:881:5: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 drivers/staging/rtl8723bs/hal/sdio_halinit.c: In function ‘CardDisableRTL8723BSdio’:
 drivers/staging/rtl8723bs/hal/sdio_halinit.c:881:5: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 drivers/staging/rtl8723bs/hal/sdio_halinit.c: In function ‘CardDisableRTL8723BSdio’:
 drivers/staging/rtl8723bs/hal/sdio_halinit.c:881:5: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 drivers/staging/rtl8723bs/hal/sdio_halinit.c: In function ‘CardDisableRTL8723BSdio’:
 drivers/staging/rtl8723bs/hal/sdio_halinit.c:881:5: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Fabio Aiuto <fabioaiuto83@gmail.com>
Cc: Stanley@BB.SD3
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-58-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>