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: 7636f09 ("platform: arm64: add Huawei Matebook E Go EC driver")
Cc: Pengyu Luo <mitltlatltl@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Link: https://lore.kernel.org/r/20250708085358.15657-1-johan@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: jhovold

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

@@ -662,6 +662,7 @@ static void gaokun_aux_release(struct device *dev)
 {
 	struct auxiliary_device *adev = to_auxiliary_dev(dev);
 
+	of_node_put(dev->of_node);
 	kfree(adev);
 }
 
@@ -693,6 +694,7 @@ static int gaokun_aux_init(struct device *parent, const char *name,
 
 	ret = auxiliary_device_init(adev);
 	if (ret) {
+		of_node_put(adev->dev.of_node);
 		kfree(adev);
 		return ret;
 	}