PVS-Studio warning V597 for PostgreSQL

char *
px_crypt_md5(const char *pw, const char *salt,
             char *passwd, unsigned dstlen)
{
  ....
  unsigned char final[MD5_SIZE];
  ....
  /* Don't leave anything around in vm they could use. */
  memset(final, 0, sizeof final);
  ....
}

This suspicious code was found in PostgreSQL project by PVS-Studio static code analyzer.
Warning message is:
V597 The compiler could delete the 'memset' function call, which is used to flush 'final' buffer. The RtlSecureZeroMemory() function should be used to erase the private data. pgcrypto crypt-md5.c 157

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