staging: r8188eu: os_dep: simplifiy the rtw_resume function

Remove unused variable ret and pwrpriv.
Remove the condition with no effect (if == else) in usb_intf.c
file.
Remove rtw_resume_process() and move whole thing to rtw_resume().
Remove the padapter NULL check which couldn't NULL in rtw_resume function.

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


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