rtc: rtc-v3020: use devm_*() functions

Use devm_*() functions to make cleanup paths simpler.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-v3020.c

@@ -309,7 +309,7 @@ static int rtc_probe(struct platform_device *pdev)
 	int i;
 	int temp;
 
-	chip = kzalloc(sizeof *chip, GFP_KERNEL);
+	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;
 
@@ -353,8 +353,8 @@ static int rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, chip);
 
-	chip->rtc = rtc_device_register("v3020",
-				&pdev->dev, &v3020_rtc_ops, THIS_MODULE);
+	chip->rtc = devm_rtc_device_register(&pdev->dev, "v3020",
+					&v3020_rtc_ops, THIS_MODULE);
 	if (IS_ERR(chip->rtc)) {
 		retval = PTR_ERR(chip->rtc);
 		goto err_io;
@@ -365,21 +365,14 @@ static int rtc_probe(struct platform_device *pdev)
 err_io:
 	chip->ops->unmap_io(chip);
 err_chip:
-	kfree(chip);
-
 	return retval;
 }
 
 static int rtc_remove(struct platform_device *dev)
 {
 	struct v3020 *chip = platform_get_drvdata(dev);
-	struct rtc_device *rtc = chip->rtc;
-
-	if (rtc)
-		rtc_device_unregister(rtc);
 
 	chip->ops->unmap_io(chip);
-	kfree(chip);
 
 	return 0;
 }