ACPI / scan: Simplify acpi_bus_extract_wakeup_device_power_package()

acpi_bus_extract_wakeup_device_power_package() is a static function
with a single caller that supplies (device->handle, &device->wakeup).

Simplify the interface so the caller need only supply "device".

This makes it obvious that "wakeup", i.e., &device->wakeup, can never
be NULL, so remove the unnecessary check for that.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/scan.c

@@ -763,18 +763,16 @@ acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 }
 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 
-static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
-					struct acpi_device_wakeup *wakeup)
+static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 {
+	acpi_handle handle = dev->handle;
+	struct acpi_device_wakeup *wakeup = &dev->wakeup;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 	union acpi_object *package = NULL;
 	union acpi_object *element = NULL;
 	acpi_status status;
 	int err = -ENODATA;
 
-	if (!wakeup)
-		return -EINVAL;
-
 	INIT_LIST_HEAD(&wakeup->resources);
 
 	/* _PRW */
@@ -883,8 +881,7 @@ static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 	if (!acpi_has_method(device->handle, "_PRW"))
 		return;
 
-	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
-							   &device->wakeup);
+	err = acpi_bus_extract_wakeup_device_power_package(device);
 	if (err) {
 		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 		return;