regulator: core: use dev_to_rdev

Use dev_to_rdev() instead of open-coding it.

Signed-off-by: Geliang Tang <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/core.c

···
 					 struct attribute *attr, int idx)
 {
 	struct device *dev = kobj_to_dev(kobj);
-	struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev);
+	struct regulator_dev *rdev = dev_to_rdev(dev);
 	const struct regulator_ops *ops = rdev->desc->ops;
 	umode_t mode = attr->mode;