extcon: Fix error handling in extcon_dev_register

[ Upstream commit d3bdd1c3 ]

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

Fixes: 046050f6 ("extcon: Update the prototype of extcon_register_notifier() with enum extcon")
Signed-off-by: NDinghao Liu <dinghao.liu@zju.edu.cn>
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/extcon/extcon.c

@@ -1256,6 +1256,7 @@ 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;
 	}