gpiolib: acpi: Move ACPI device NULL check to acpi_get_driver_gpio_data()

It's logical to check ACPI device for NULL inside
acpi_get_driver_gpio_data() instead of requiring that
in each caller.

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

Author: andy-shev

drivers/gpio/gpiolib-acpi.c

@@ -645,7 +645,7 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
 {
 	const struct acpi_gpio_mapping *gm;
 
-	if (!adev->driver_gpios)
+	if (!adev || !adev->driver_gpios)
 		return false;
 
 	for (gm = adev->driver_gpios; gm->name; gm++)
@@ -839,13 +839,10 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
 	ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
 						 &args);
 	if (ret) {
-		struct acpi_device *adev = to_acpi_device_node(fwnode);
+		struct acpi_device *adev;
 
-		if (!adev)
-			return ret;
-
-		if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
-					       &quirks))
+		adev = to_acpi_device_node(fwnode);
+		if (!acpi_get_driver_gpio_data(adev, propname, index, &args, &quirks))
 			return ret;
 	}
 	/*