remove unused 'tmpdata' and 'backup' ftp_parselist_data struct members

    } NT;

  } state;

  struct {

    char *buffer;

    size_t bufferlength; /* how many bytes is allocated at *buffer */

    size_t bufferin; /* how many bytes is in buffer */

  } tmpdata;

  struct {

    curl_write_callback old_fwritefunc;

    FILE *old_file_descriptor;

  } backup;

  CURLcode error;

  struct curl_fileinfo *file_data;

  unsigned int item_length;