ITS#7224 check *_names pointer before dereferencing

servers/slapd/at.c

@@ -232,6 +232,8 @@ at_delete_names( AttributeType *at )
 {
 	char			**names = at->sat_names;
 
+	if (!names) return;
+
 	while (*names) {
 		struct aindexrec	tmpair, *air;
 

servers/slapd/oc.c

@@ -400,6 +400,8 @@ oc_delete_names( ObjectClass *oc )
 {
 	char			**names = oc->soc_names;
 
+	if (!names) return;
+
 	while (*names) {
 		struct oindexrec	tmpoir, *oir;