USB: usb-skeleton: use anchors in disconnect handling

use anchors in disconnect handling
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/usb-skeleton.c

@@ -420,6 +420,8 @@ static void skel_disconnect(struct usb_interface *interface)
 	dev->interface = NULL;
 	mutex_unlock(&dev->io_mutex);
 
+	usb_kill_anchored_urbs(&dev->submitted);
+
 	/* decrement our usage count */
 	kref_put(&dev->kref, skel_delete);