improved debug messages when getpwnam_r() doesn't return a user
improved debug messages when getpwnam_r() doesn't return a user

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