small fix in delete

@@ -35,6 +35,9 @@ TR_queueDelete(TR_Queue this, void * msg)
 	if (node == this->last) {
 		this->last = parent;
 	}
+	if (node == this->first) {
+		this->first = node->next;
+	}
 	TR_delete(node);
 	this->nmsg--;
 }