rtc: rtc-bq32k: 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-bq32k.c

@@ -153,7 +153,7 @@ static int bq32k_probe(struct i2c_client *client,
 	if (error)
 		return error;
 
-	rtc = rtc_device_register(bq32k_driver.driver.name, &client->dev,
+	rtc = devm_rtc_device_register(&client->dev, bq32k_driver.driver.name,
 						&bq32k_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
@@ -165,9 +165,6 @@ static int bq32k_probe(struct i2c_client *client,
 
 static int bq32k_remove(struct i2c_client *client)
 {
-	struct rtc_device *rtc = i2c_get_clientdata(client);
-
-	rtc_device_unregister(rtc);
 	return 0;
 }