gpio: sim: include a missing header

We're using various ERR macros from linux/err.h but the include is
missing. Add it.

Fixes: cb8c474e79 ("gpio: sim: new testing module")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2023-09-15 14:34:23 +02:00
commit db8588f95c