Linux: Fix warning: comparison between signed and unsigned
Linux: Fix warning: comparison between signed and unsigned

libusbx.git commit 36a7119bf296cecd4e910bef86908fd782224960

tenderlove/libusb,legege/libusb,bert/libusb,ashima/libusb,dasdeepak/libusb,ashima/libusb,dasdeepak/libusb,hjelmn/libusb-darwin,mojca/libusb_pico,bert/libusb,ashima/libusb,tenderlove/libusb,legege/libusb,hjelmn/libusb-darwin,dasdeepak/libusb,legege/libusb,mojca/libusb_pico