Package: avrdude Version: 6.1-4 Compiling avrdude with -Wextra reveals two cases of unreachable code due to a comparison unsigned < 0: avrftdi.c: In function ‘set_frequency’: avrftdi.c:201:14: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] if (divisor < 0) { ^ usb_libusb.c: In function ‘usbdev_recv_frame’: usb_libusb.c:543:14: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] if (nbytes < 0) ^