rtc: rtc-rx8581: 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-rx8581.c

@@ -240,8 +240,8 @@ static int rx8581_probe(struct i2c_client *client,
 
 	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
 
-	rtc = rtc_device_register(rx8581_driver.driver.name,
-				&client->dev, &rx8581_rtc_ops, THIS_MODULE);
+	rtc = devm_rtc_device_register(&client->dev, rx8581_driver.driver.name,
+					&rx8581_rtc_ops, THIS_MODULE);
 
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
@@ -253,10 +253,6 @@ static int rx8581_probe(struct i2c_client *client,
 
 static int rx8581_remove(struct i2c_client *client)
 {
-	struct rtc_device *rtc = i2c_get_clientdata(client);
-
-	rtc_device_unregister(rtc);
-
 	return 0;
 }