listpw/verifypw processing in LDAP/SSSD

Hello,
 I'm analyzing a bug report and got around to reading code that checks
whether or not to require authentication from the user. There's this
piece of code in plugins/sudoers/ldap.c, sudo_ldap_lookup, lines
2998-3039 (sudo-1.8.12 tarball):

...
2998   if (pwflag) {
2999       int doauth = UNSPEC;
3000       int matched = UNSPEC;
3001       enum def_tuple pwcheck =
3002           (pwflag == -1) ? never : sudo_defs_table[pwflag].sd_un.tuple;
3003
3004       DPRINTF1("perform search for pwflag %d", pwflag);
3005       for (i = 0; i < lres->nentries; i++) {
3006           entry = lres->entries[i].entry;
3007           if ((pwcheck == any && doauth != false) ||
3008               (pwcheck == all && doauth == false)) {
3009               doauth = sudo_ldap_check_bool(ld, entry, "authenticate");
3010           }
...
(doauth is not set anywhere else in this function)

Now, if pwcheck is set to "all", then there's no way the code gets to check
the "authenticate" boolean (sudoOption), is there? Since "doauth" is set to
"-1" (UNSPEC) and (int)-1 == false is never true. Is this intended? It seems
to break the usage of the listpw and verifypw options in combination with the
!authenticate option specified per-user in ldap (and in sssd since there's
basically the same code).

Thanks,
Dan K.
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