fix compiler warning: variable was set but never used

    timeout.tv_usec = 0;

    m = curl_multi_fdset(mhandle, &fdread, &fdwrite, &fdexcep, &max_fdset);

    if(m != CURLM_OK) {

      fprintf(stderr, "curl_multi_fdset() error\n");

      goto test_cleanup;

    }

    rc = select(max_fdset + 1, &fdread, &fdwrite, &fdexcep, &timeout);

    if(rc == -1) {

      fprintf(stderr, "select() error\n");