rtc: class: fix double free in rtc_register_device() error path

Commit 59cca865f21e ("drivers/rtc/class.c: fix device_register() error
handling") correctly noted that naked kfree() should not be used after
failed device_register() call, however, while it added the needed
put_device() it forgot to remove the original kfree() causing double-free.

Cc: Vasiliy Kulikov <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/class.c

···
 
 	err = device_register(&rtc->dev);
 	if (err) {
+		/* This will free both memory and the ID */
 		put_device(&rtc->dev);
-		goto exit_kfree;
+		goto exit;
 	}
 
 	rtc_dev_add_device(rtc);
···
 			rtc->name, dev_name(&rtc->dev));
 
 	return rtc;
-
-exit_kfree:
-	kfree(rtc);
 
 exit_ida:
 	ida_simple_remove(&rtc_ida, id);