staging: r8188eu: make return values consistent

rtw_pwr_wakeup should return _SUCCESS or _FAIL.

Replace false with _FAIL in one place and reformat the if-statement.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220413193654.258507-3-martin@kaiser.cx


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