get the first configuration value instead of the last because that one is also written (based on r1567 from 0.8)

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd-0.7.15+squeeze@1969 ef36b2f9-881f-0410-afb5-c4e39611909c