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>

Author: andy-shev

drivers/gpio/gpiolib-acpi-core.c

@@ -382,8 +382,8 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
 	desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
 	if (IS_ERR(desc)) {
 		dev_err(chip->parent,
-			"Failed to request GPIO for pin 0x%04X, err %ld\n",
-			pin, PTR_ERR(desc));
+			"Failed to request GPIO for pin 0x%04X, err %pe\n",
+			pin, desc);
 		return AE_OK;
 	}