gpiolib: acpi: Use %pe when passing an error pointer to dev_err()

One of the coccinelle recipe suggests to use %pe when we deal with
an error pointer. Do it so.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@inria.fr>
Closes: https://lore.kernel.org/r/202510231350.calxvXIm-lkp@intel.com/


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>