PM: wakeup: make device_wakeup_disable() return void

The device_wakeup_disable() call only returns an error if no dev exists,
but there's not much a user can do at that point.

Rather, make this function return void.

Signed-off-by: Dhruva Gole <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/base/power/wakeup.c

···
  * Detach the @dev's wakeup source object from it, unregister this wakeup source
  * object and destroy it.
  */
-int device_wakeup_disable(struct device *dev)
+void device_wakeup_disable(struct device *dev)
 {
 	struct wakeup_source *ws;
 
 	if (!dev || !dev->power.can_wakeup)
-		return -EINVAL;
+		return;
 
 	ws = device_wakeup_detach(dev);
 	wakeup_source_unregister(ws);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(device_wakeup_disable);
 
···
  */
 int device_set_wakeup_enable(struct device *dev, bool enable)
 {
-	return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
+	if (enable)
+		return device_wakeup_enable(dev);
+
+	device_wakeup_disable(dev);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
 

drivers/mmc/host/sdhci-pci-core.c

···
 	if ((pm_flags & MMC_PM_KEEP_POWER) && (pm_flags & MMC_PM_WAKE_SDIO_IRQ))
 		return device_wakeup_enable(&chip->pdev->dev);
 	else if (!cap_cd_wake)
-		return device_wakeup_disable(&chip->pdev->dev);
+		device_wakeup_disable(&chip->pdev->dev);
 
 	return 0;
 }

include/linux/pm_wakeup.h

···
 extern struct wakeup_source *wakeup_sources_walk_start(void);
 extern struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws);
 extern int device_wakeup_enable(struct device *dev);
-extern int device_wakeup_disable(struct device *dev);
+extern void device_wakeup_disable(struct device *dev);
 extern void device_set_wakeup_capable(struct device *dev, bool capable);
 extern int device_set_wakeup_enable(struct device *dev, bool enable);
 extern void __pm_stay_awake(struct wakeup_source *ws);
···
 	return 0;
 }
 
-static inline int device_wakeup_disable(struct device *dev)
+static inline void device_wakeup_disable(struct device *dev)
 {
 	dev->power.should_wakeup = false;
-	return 0;
 }
 
 static inline int device_set_wakeup_enable(struct device *dev, bool enable)