usb_find_int_in_endpoint
retcode = usb_find_int_in_endpoint(iface_desc, &int_in);
retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint);
ret = usb_find_int_in_endpoint(desc, &endpoint);
res = usb_find_int_in_endpoint(iface_desc, &endpoint);
res = usb_find_int_in_endpoint(alt, &ep_int);