Revert "Wait with declaring PAM_SUCCESS on challenge-response until new"
Revert "Wait with declaring PAM_SUCCESS on challenge-response until new"

Tollef has argued that the login should not fail if, for example, the
disk is full. I'd rather fail on the cautious side and make sure we
don't end up always sending the same challenge to the YubiKey, but I'll
leave it up to Tollef to decide for now.

This reverts commit 14e917ffae52e05121a69a192d03f98090e8ae41.

Conflicts:

	pam_yubico.c

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