Fix warnings. Reported by Patrick Neave <p.neave@gmail.com>.
Fix warnings.
Reported by Patrick Neave <p.neave@gmail.com>.


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