firewire: cdev: fix race of ioctl_send_request with bus reset

The bus reset handler concurrently frees client->device->node.  Use
device->node_id instead.  This is equivalent to device->node->node_id
while device->generation is current.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/fw-cdev.c

@@ -585,7 +585,7 @@ static int ioctl_send_request(struct client *client, void *buffer)
 		return -EINVAL;
 	}
 
-	return init_request(client, request, client->device->node->node_id,
+	return init_request(client, request, client->device->node_id,
 			    client->device->max_speed);
 }