Present filter on unrecognized attribute types

[Bob Pepin <bob@gms.lu>]

Hi,
When slapd finds a present filter with an invalid attribute it evaluates to 
UNDEFINED for that filter instead of FALSE. From rfc2251:

    The present match evaluates to TRUE where there is an attribute or
    subtype of the specified attribute description present in an entry,
    and FALSE otherwise (including a presence test with an unrecognized
    attribute description.)

Here's the diff:
--- openldap-2.0.17/servers/slapd.orig/filter.c Fri Aug 31 22:24:17 2001
+++ openldap-2.0.17/servers/slapd/filter.c      Tue Nov 13 10:13:56 2001
@@ -183,6 +183,10 @@
               err = slap_bv2ad( &type, &f->f_desc, text );

               if( err != LDAP_SUCCESS ) {
+                /* unknown attributes evaluate to false */
+                       f->f_choice = SLAPD_FILTER_COMPUTED;
+                       f->f_result = LDAP_COMPARE_FALSE;
+                       err = LDAP_SUCCESS;
                       ch_free( type.bv_val );
                       break;
               }