rtc: rtc-em3027: 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-em3027.c

@@ -121,7 +121,7 @@ static int em3027_probe(struct i2c_client *client,
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
 
-	rtc = rtc_device_register(em3027_driver.driver.name, &client->dev,
+	rtc = devm_rtc_device_register(&client->dev, em3027_driver.driver.name,
 				  &em3027_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
@@ -133,11 +133,6 @@ static int em3027_probe(struct i2c_client *client,
 
 static int em3027_remove(struct i2c_client *client)
 {
-	struct rtc_device *rtc = i2c_get_clientdata(client);
-
-	if (rtc)
-		rtc_device_unregister(rtc);
-
 	return 0;
 }