regulator: fix device_register() error handling

If device_register() fails then call put_device().
See comment to device_register.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/core.c

@@ -2302,8 +2302,10 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
 	dev_set_name(&rdev->dev, "regulator.%d",
 		     atomic_inc_return(&regulator_no) - 1);
 	ret = device_register(&rdev->dev);
-	if (ret != 0)
+	if (ret != 0) {
+		put_device(&rdev->dev);
 		goto clean;
+	}
 
 	dev_set_drvdata(&rdev->dev, rdev);