gpiolib: Allow to use setters with return value for output-only gpios

gpiolib: Allow to use setters with return value for output-only gpios

The gpiod_direction_output_raw_commit() function checks if any setter
callback is present before doing anything. As the new GPIO setters with
return values were introduced, make this check also succeed if one is
present.

Fixes: 98ce1eb1fd87 ("gpiolib: introduce gpio_chip setters that return values")
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Link: https://lore.kernel.org/r/20250411-mdb-gpiolib-setters-fix-v2-1-9611280d8822@bootlin.com
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>