gpio: acpi: Skip _AEI entries without a handler rather then aborting the scan

acpi_walk_resources will stop as soon as the callback passed in returns
an error status. On a x86 tablet I have the first GpioInt in the _AEI
resource list has no handler defined in the DSDT, causing
acpi_walk_resources to abort scanning the rest of the resource list,
which does define valid ACPI GPIO events.

This commit changes the return for not finding a handler from
AE_BAD_PARAMETER to AE_OK so that the rest of the resource list will
get scanned normally in case of missing event handlers.

Signed-off-by: Hans de Goede <[e-mail]>
Acked-by: Mika Westerberg <[e-mail]>
Acked-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpiolib-acpi.c

···
 			handler = acpi_gpio_irq_handler_evt;
 	}
 	if (!handler)
-		return AE_BAD_PARAMETER;
+		return AE_OK;
 
 	pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
 	if (pin < 0)