staging: rtl8723bs: Change the return type

Remove the ret variable in rtw_suspend_common() and change
the return type from int to void as rtw_suspend_common()
always return zero unconditionally.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/20210428175520.GA8921@user


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