staging: rtl8188eu: remove return variable from rtw_init_bcmc_stainfo

Remove variable res, that is used to store the return value, from
rtw_init_bcmc_stainfo. Instead return _FAIL or _SUCCESS directly
and remove the now unneeded exit label.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20191027130604.68379-3-straube.linux@gmail.com


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