fix memory leak in myldap_get_values_len() when using ranged attributes (very unlikely to occur)

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd@1910 ef36b2f9-881f-0410-afb5-c4e39611909c
check result of set_tolist() to ensure that memory allocation problems are logged

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd@1911 ef36b2f9-881f-0410-afb5-c4e39611909c
have myldap_get_ranged_values() return a list of values instead of a set

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd@1912 ef36b2f9-881f-0410-afb5-c4e39611909c