rtc: rtc-tile: 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-tile.c

@@ -80,8 +80,8 @@ static int tile_rtc_probe(struct platform_device *dev)
 {
 	struct rtc_device *rtc;
 
-	rtc = rtc_device_register("tile",
-				  &dev->dev, &tile_rtc_ops, THIS_MODULE);
+	rtc = devm_rtc_device_register(&dev->dev, "tile",
+				&tile_rtc_ops, THIS_MODULE);
 
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
@@ -96,11 +96,6 @@ static int tile_rtc_probe(struct platform_device *dev)
  */
 static int tile_rtc_remove(struct platform_device *dev)
 {
-	struct rtc_device *rtc = platform_get_drvdata(dev);
-
-	if (rtc)
-		rtc_device_unregister(rtc);
-
 	platform_set_drvdata(dev, NULL);
 
 	return 0;