staging: r8188eu: Remove unneeded variable ret in rtw_suspend()

Fix the following coccicheck error:
drivers/staging/r8188eu/os_dep/usb_intf.c:202:5-8: Unneeded variable: "ret". Return "0" on line 242

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Link: https://lore.kernel.org/r/20220422021046.121870-1-wanjiabing@vivo.com


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