case M_KENDRA:
int mx_check_empty (const char *path){  switch (mx_get_magic (path))  {    case M_MBOX:    case M_MMDF:    case M_KENDRA:      return mbox_check_empty (path);    case M_MH:      return mh_check_empty (path);    case M_MAILDIR:      return maildir_check_empty (path);    default:      errno = EINVAL;      return -1;  }  /* not reached */}