gpiod_free() is an internal function for gpiolib, gpiod_put() is the
correct external function.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Suggested-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NMark Brown <broonie@kernel.org>