Fix while loop abort condition

@@ -73,7 +73,7 @@ TR_eventDispatcherStart(TR_EventDispatcher this)
 			size_t       idx  = TR_queueFirst(handler_queue);
 			TR_EventDone done = TR_EVENT_PENDING;
 
-			while (idx != TR_queueLast(handler_queue)) {
+			while (idx != TR_queueLast(handler_queue) + 1) {
 				TR_EventHandler handler = handler_queue->data[idx];
 				TR_EventDone    this_done;