PVS-Studio warning V595 for glibc

int __nss_getent_r (....)
{
  ....
  if (res && __res_maybe_init (&_res, 0) == -1)
  {
    *h_errnop = NETDB_INTERNAL;
    *result = NULL;
    return errno;
  }
  ....
  if (status == NSS_STATUS_TRYAGAIN
      && (h_errnop == NULL || *h_errnop == NETDB_INTERNAL)
      && errno == ERANGE)
}

This suspicious code was found in glibc project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'h_errnop' pointer was utilized before it was verified against nullptr. Check lines: 146, 172. getnssent_r.c 146

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