rtc: rtc-tps80031: use devm_rtc_device_register()

devm_rtc_device_register() is device managed and makes 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-tps80031.c

@@ -277,7 +277,7 @@ static int tps80031_rtc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
+	rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
 			       &tps80031_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc->rtc)) {
 		ret = PTR_ERR(rtc->rtc);
@@ -292,7 +292,6 @@ static int tps80031_rtc_probe(struct platform_device *pdev)
 	if (ret < 0) {
 		dev_err(&pdev->dev, "request IRQ:%d failed, err = %d\n",
 			 rtc->irq, ret);
-		rtc_device_unregister(rtc->rtc);
 		return ret;
 	}
 	device_set_wakeup_capable(&pdev->dev, 1);
@@ -301,9 +300,6 @@ static int tps80031_rtc_probe(struct platform_device *pdev)
 
 static int tps80031_rtc_remove(struct platform_device *pdev)
 {
-	struct tps80031_rtc *rtc = platform_get_drvdata(pdev);
-
-	rtc_device_unregister(rtc->rtc);
 	return 0;
 }