Init ors_limit to NULL

servers/slapd/overlays/unique.c

@@ -328,6 +328,7 @@ static int unique_search(
 	nop->o_tag	= LDAP_REQ_SEARCH;
 	nop->ors_scope	= LDAP_SCOPE_SUBTREE;
 	nop->ors_deref	= LDAP_DEREF_NEVER;
+	nop->ors_limit	= NULL;
 	nop->ors_slimit	= SLAP_NO_LIMIT;
 	nop->ors_tlimit	= SLAP_NO_LIMIT;
 	nop->ors_attrs	= slap_anlist_no_attrs;