fix tpool key reset (ITS#4855)

CHANGES

@@ -5,6 +5,7 @@ OpenLDAP 2.3.35 Engineering
 	Fixed slapd-bdb/hdb startup with missing shm env (ITS#4851)
 	Fixed slapd-meta/slapo-rwm filter mapping
 	Fixed slapo-refint config message (ITS#4853)
+	Fixed libldap_r tpool reset (ITS#4855)
 
 OpenLDAP 2.3.34 Release (2007/02/16)
 	Fixed libldap missing get_option(TLS CipherSuite) (ITS#4815)

libraries/libldap_r/tpool.c

@@ -664,7 +664,7 @@ void ldap_pvt_thread_pool_context_reset( void *vctx )
 	int i;
 
 	for ( i=MAXKEYS-1; i>=0; i--) {
-		if ( ctx[i].ltk_key )
+		if ( ctx[i].ltk_key == NULL )
 			continue;
 		if ( ctx[i].ltk_free )
 			ctx[i].ltk_free( ctx[i].ltk_key, ctx[i].ltk_data );