修复连接重复关闭的问题

platform/src/tcp_stream.cpp

@@ -381,6 +381,7 @@ static void __conn_private_destory_with_ssl(struct event_base * ev_base,
 {
 	if (ssl_stream == NULL) return __conn_private_destory(conn);
 	ssl_stream_free_and_close_fd(ssl_stream, ev_base, conn->bev);
+	conn->fd = -1;
 	return __conn_private_destory(conn);
 }