Small fix in NEW_AUTHTOK_REQD handling
Small fix in NEW_AUTHTOK_REQD handling

There is a potential memory leak if the old password is saved multiple
times. Furthermore, PAM_NEW_AUTHTOK_REQD is only allowed as a result of
the authorisation phase, not the authentication phase so there is no use
in checking.

arthurdejong/nss-pam-ldapd,arthurdejong/nss-pam-ldapd,arthurdejong/nss-pam-ldapd