ASoC: amd: Fix error pointer dereference

The "gpio_pa" pointer is an error pointer, there is no need to try
put it.  Calling gpiod_put() on it will lead to an error pointer
dereference.

Fixes: 02527c3f

 ("ASoC: amd: add Machine driver for Jadeite platform")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/Ys2IRPHWGIwuVs21@kili
Signed-off-by: Mark Brown <broonie@kernel.org>