message: clear gzip buffer.
diff: @@ -1753,6 +1753,7 @@ static int http_client_parser_on_message_complete(php_http_parser *parser)
  #ifdef SW_HAVE_ZLIB
  if (http->gzip && http->body->length > 0)
  {
  + swString_clear(http->gzip_buffer);
  if (http_response_uncompress(&http->gzip_stream, http->gzip_buffer, http->body->str, http->body->length) == SW_ERR)
  {
  swWarn("http_response_uncompress failed.");
  