linux-phytec-fsl

gpio: sysfs: preparatory clean ups

Put the recently introduced gpio-chip pointer to some more use in
gpiod_export.

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>