PVS-Studio warning V597 for NSS

SECStatus HMAC_Init(....)
{
  unsigned char hashed_secret[HASH_LENGTH_MAX];
  ....
loser:
  PORT_Memset(hashed_secret, 0, sizeof hashed_secret);
  if (cx->hash != NULL)
    cx->hashobj->destroy(cx->hash, PR_TRUE);
  return SECFailure;
}

This suspicious code was found in NSS project by PVS-Studio static code analyzer.
Warning message is:
V597 The compiler could delete the 'memset' function call, which is used to flush 'hashed_secret' buffer. The RtlSecureZeroMemory() function should be used to erase the private data. alghmac.c 87

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