rem: else s = 0;
context: print_errno_message (int errnum){  char const *s;#if defined HAVE_STRERROR_R || _LIBC  char errbuf[1024];# if STRERROR_R_CHAR_P || _LIBC  s = __strerror_r (errnum, errbuf, sizeof errbuf);# else  if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)    s = errbuf;  else    s = 0;# endif#else  s = strerror (errnum);#endif#if !_LIBC  if (! s)    s = _("Unknown system error");#endif#if _LIBC  if (_IO_fwide (stderr, 0) > 0)    {      __fwprintf (stderr, L": %s", s);      return;    }#endif  fprintf (stderr, ": %s", s);}