fixup warnings with sign
fixup warnings with sign

Yubico/yubico-pam,Yubico/yubico-pam,eworm-de/yubico-pam,madrat-/yubico-pam,Yubico/yubico-pam,eworm-de/yubico-pam,madrat-/yubico-pam,eworm-de/yubico-pam,madrat-/yubico-pam