staging: media: imx: fix OF node leak in imx_media_add_of_subdevs()

imx_media_add_of_subdevs() calls of_parse_phandle() and passes the
obtained node to imx_media_of_add_csi(). The passed node is used in
v4l2_async_nf_add_fwnode(), which increments the refcount of the node.
Therefore, while the current implementation only releases the node when
imx_media_of_add_csi() fails, but should always release it. Call
of_node_put() right after imx_media_of_add_csi().

Fixes: dee747f ("media: imx: Don't register IPU subdevs/links if CSI port missing")
Signed-off-by: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

Author: joehattori

drivers/staging/media/imx/imx-media-of.c

@@ -54,22 +54,18 @@ int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
 			break;
 
 		ret = imx_media_of_add_csi(imxmd, csi_np);
+		of_node_put(csi_np);
 		if (ret) {
 			/* unavailable or already added is not an error */
 			if (ret == -ENODEV || ret == -EEXIST) {
-				of_node_put(csi_np);
 				continue;
 			}
 
 			/* other error, can't continue */
-			goto err_out;
+			return ret;
 		}
 	}
 
 	return 0;
-
-err_out:
-	of_node_put(csi_np);
-	return ret;
 }
 EXPORT_SYMBOL_GPL(imx_media_add_of_subdevs);