Avoid returning CHM file entries that are "blank" because they have embedded null bytes
static struct mschmd_header *chmd_open(struct mschm_decompressor *base,
				       const char *filename)
{
  return chmd_real_open(base, filename, 1);
}

static struct mschmd_header *chmd_open(struct mschm_decompressor *base,
				       const char *filename)
{
  return chmd_real_open(base, filename, 1);
}
