/* normal operation: executing a command in this subdevice */
this_usbduxsub->ao_counter--;
- if (this_usbduxsub->ao_counter <= 0) {
+ if ((int)this_usbduxsub->ao_counter <= 0) {
/* timer zero */
this_usbduxsub->ao_counter = this_usbduxsub->ao_timer;