DDS overlay: fix TTL tolerance

olcDDStolerance setting had inverse effect and in fact was shortening entries real TTL

From cca0da2163f1ec83352d86015cf6b9b42b757dc7 Mon Sep 17 00:00:00 2001
Author: Jan Vcelak <jvcelak@redhat.com>
Upstream ITS: #7017
Resolves: #733069

---
 servers/slapd/overlays/dds.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/servers/slapd/overlays/dds.c b/servers/slapd/overlays/dds.c
index 56d299f..661b309 100644
--- a/servers/slapd/overlays/dds.c
+++ b/servers/slapd/overlays/dds.c
@@ -156,7 +156,7 @@ dds_expire( void *ctx, dds_info_t *di )
 	op->ors_slimit = SLAP_NO_LIMIT;
 	op->ors_attrs = slap_anlist_no_attrs;
 
-	expire = slap_get_time() + di->di_tolerance;
+	expire = slap_get_time() - di->di_tolerance;
 	ts.bv_val = tsbuf;
 	ts.bv_len = sizeof( tsbuf );
 	slap_timestamp( &expire, &ts );
-- 
1.7.6