[PATCH 0/3] gpiolib: add checks and error message

[Antony Pavlov]

This patchseries adds additional trivial checks and error message.

[PATCH 1/3] gpiolib: gpio_request(): print message on error
[PATCH 2/3] gpiolib: gpio_free: clear gpio's "label" field too
[PATCH 3/3] gpiolib: gpiolib command: show label only for requested