[media] v4l2-device: fix a missing error code

We need to set "err = -ENOMEM" here.

Fixes: 38b11f19667a ('[media] v4l2-core: create MC interfaces for devnodes')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/v4l2-core/v4l2-device.c

@@ -267,9 +267,11 @@ int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
 			link = media_create_intf_link(&sd->entity,
 						      &vdev->intf_devnode->intf,
 						      MEDIA_LNK_FL_ENABLED);
-			if (!link)
+			if (!link) {
+				err = -ENOMEM;
 				goto clean_up;
 			}
+		}
 #endif
 		sd->devnode = vdev;
 	}