gpiolib: fix a NULL-pointer dereference when setting direction

For optional GPIOs we may pass NULL to gpiod_direction_(input|output)().
With the call to the notifier chain added by commit 07c61d4da43f
("gpiolib: notify user-space about in-kernel line state changes") we
will now dereference a NULL pointer in this case. The reason for that is
the fact that the expansion of the VALIDATE_DESC() macro (which returns
0 for NULL descriptors) was moved into the nonotify variants of the
direction setters.

Move them back to the top-level interfaces as the nonotify ones are only
ever called from inside the GPIO core and are always passed valid GPIO
descriptors. This way we'll never call the line_state notifier chain
with non-valid descs.

Fixes: 07c61d4da43f ("gpiolib: notify user-space about in-kernel line state changes")
Reported-by: Mark Brown <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Tested-by: Klara Modin <[email protected]>
Tested-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>

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