Host Panic on MacOS

[hftsai256]

Example program host would panic on MacOS with LIBUSB_ERROR_NOT_FOUND when hitting USB Billboard Device 2109:8884. An easy workaround is to handle errors from dev.active_config_descriptor() like:

(around src/lib.rs:57)

let cfg = match dev.active_config_descriptor() {
    Ok(cfg) => cfg,
    Err(err) => {
        println!("LibUSB Error: {:?}: {}", dev, err);
        continue;
    }
};

I haven't had a chance to test it thoroughly (by doing some programming on some developing SBCs), but at least I can now list available devices from M1 Macs.