remove unused variable and make sleep ints unsigned
remove unused variable and make sleep ints unsigned

dmitriykuptsov/yubikey-personalization,eworm-de/yubikey-personalization,eworm-de/yubikey-personalization,Yubico/yubikey-personalization,dmitriykuptsov/yubikey-personalization,Yubico/yubikey-personalization-dpkg,Yubico/yubikey-personalization-dpkg,Yubico/yubikey-personalization,dmitriykuptsov/yubikey-personalization,Yubico/yubikey-personalization-dpkg,eworm-de/yubikey-personalization