rtc: rtc-ds2404: use devm_*() functions

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

drivers/rtc/rtc-ds2404.c

@@ -228,7 +228,7 @@ static int rtc_probe(struct platform_device *pdev)
 	struct ds2404 *chip;
 	int retval = -EBUSY;
 
-	chip = kzalloc(sizeof(struct ds2404), GFP_KERNEL);
+	chip = devm_kzalloc(&pdev->dev, sizeof(struct ds2404), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;
 
@@ -244,8 +244,8 @@ static int rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, chip);
 
-	chip->rtc = rtc_device_register("ds2404",
-				&pdev->dev, &ds2404_rtc_ops, THIS_MODULE);
+	chip->rtc = devm_rtc_device_register(&pdev->dev, "ds2404",
+					&ds2404_rtc_ops, THIS_MODULE);
 	if (IS_ERR(chip->rtc)) {
 		retval = PTR_ERR(chip->rtc);
 		goto err_io;
@@ -257,20 +257,14 @@ 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 ds2404 *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;
 }