message: Fix uninitialized http_context (possible lead to error if we add properties to it but may not notice that)
diff: @@ -1075,7 +1075,7 @@ int swoole_http2_server_onFrame(swServer *serv, swConnection *conn, swEventData
  client->handle = swoole_http2_onRequest;
  if (!client->default_ctx)
  {
  - client->default_ctx = (http_context *) emalloc(sizeof(*client->default_ctx));
  + client->default_ctx = (http_context *) ecalloc(1, sizeof(http_context));
  swoole_http_server_init_context(serv, client->default_ctx);
  client->default_ctx->fd = session_id;
  client->default_ctx->http2 = true;
  