pjsip_options.c: Fix container operation.

aor_observer_deleted() needs to operate on all contacts found for the
deleted AOR instead of only the first one found.  This is really only a
problem if there is more than one contact for the AOR.

Change-Id: Id24ac0d5e8c931330231fb45dd2a331a84339dc1

res/res_pjsip/pjsip_options.c

@@ -1264,7 +1264,7 @@ static void aor_observer_deleted(const void *obj)
 
 	contacts = ast_sip_location_retrieve_aor_contacts(aor);
 	if (contacts) {
-		ao2_callback(contacts, OBJ_NODATA, unschedule_contact_cb, NULL);
+		ao2_callback(contacts, OBJ_NODATA | OBJ_MULTIPLE, unschedule_contact_cb, NULL);
 		ao2_ref(contacts, -1);
 	}
 }