platform: arm64: huawei-gaokun-ec: fix OF node leak

Make sure to drop the OF node reference taken when creating the Gaokun
auxiliary devices when the devices are later released.

Fixes: 7636f090d02e ("platform: arm64: add Huawei Matebook E Go EC driver")
Cc: Pengyu Luo <[e-mail]>
Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Pengyu Luo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Ilpo Järvinen <[e-mail]>
Signed-off-by: Ilpo Järvinen <[e-mail]>

drivers/platform/arm64/huawei-gaokun-ec.c

···
 {
 	struct auxiliary_device *adev = to_auxiliary_dev(dev);
 
+	of_node_put(dev->of_node);
 	kfree(adev);
 }
 
···
 
 	ret = auxiliary_device_init(adev);
 	if (ret) {
+		of_node_put(adev->dev.of_node);
 		kfree(adev);
 		return ret;
 	}