add: return MEDIA_TYPE_ERROR; if (!cache->mountpoint)
context: cd_cache_disc_is_vcd (CdCache *cache,                      GError **error){  if (!cache->mountpoint)    return MEDIA_TYPE_ERROR;  /* open disc and open mount */  if (!cd_cache_open_device (cache, error))    return MEDIA_TYPE_ERROR;  if (!cd_cache_open_mountpoint (cache, error))    return MEDIA_TYPE_ERROR;  /* first is VCD, second is SVCD */  if (cd_cache_file_exists (cache, "MPEGAV", "AVSEQ01.DAT") ||      cd_cache_file_exists (cache, "MPEG2", "AVSEQ01.MPG"))    return MEDIA_TYPE_VCD;  return MEDIA_TYPE_DATA;}