rtc: rtc-rs5c313: 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-rs5c313.c

@@ -367,7 +367,7 @@ static const struct rtc_class_ops rs5c313_rtc_ops = {
 
 static int rs5c313_rtc_probe(struct platform_device *pdev)
 {
-	struct rtc_device *rtc = rtc_device_register("rs5c313", &pdev->dev,
+	struct rtc_device *rtc = devm_rtc_device_register(&pdev->dev, "rs5c313",
 				&rs5c313_rtc_ops, THIS_MODULE);
 
 	if (IS_ERR(rtc))
@@ -380,10 +380,6 @@ static int rs5c313_rtc_probe(struct platform_device *pdev)
 
 static int rs5c313_rtc_remove(struct platform_device *pdev)
 {
-	struct rtc_device *rtc = platform_get_drvdata( pdev );
-
-	rtc_device_unregister(rtc);
-
 	return 0;
 }