extcon: Fix error handling in extcon_dev_register

BugLink: https://bugs.launchpad.net/bugs/1923869

[ Upstream commit d3bdd1c ]

When devm_kcalloc() fails, we should execute device_unregister()
to unregister edev->dev from system.

Fixes: 046050f ("extcon: Update the prototype of extcon_register_notifier() with enum extcon")
Signed-off-by: Dinghao Liu <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Stefan Bader <[email protected]>

Author: dinghaoliu

drivers/extcon/extcon.c

@@ -1241,6 +1241,7 @@ int extcon_dev_register(struct extcon_dev *edev)
 				sizeof(*edev->nh), GFP_KERNEL);
 	if (!edev->nh) {
 		ret = -ENOMEM;
+		device_unregister(&edev->dev);
 		goto err_dev;
 	}