driver core: dev_set_drvdata returns void

dev_set_drvdata can no longer fail, so it could return void.

All callers have hopefully been updated to no longer check for the
return value.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/dd.c

@@ -600,9 +600,8 @@ void *dev_get_drvdata(const struct device *dev)
 }
 EXPORT_SYMBOL(dev_get_drvdata);
 
-int dev_set_drvdata(struct device *dev, void *data)
+void dev_set_drvdata(struct device *dev, void *data)
 {
 	dev->driver_data = data;
-	return 0;
 }
 EXPORT_SYMBOL(dev_set_drvdata);