PVS-Studio warning V597 for NSS

SECStatus
SHA384_HashBuf(unsigned char *dest, const unsigned char *src,
               PRUint32 src_length)
{
  SHA512Context ctx;
  unsigned int outLen;

  SHA384_Begin(&ctx);
  SHA512_Update(&ctx, src, src_length);
  SHA512_End(&ctx, dest, &outLen, SHA384_LENGTH);
  memset(&ctx, 0, sizeof ctx);

  return SECSuccess;
}

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 'ctx' object. The RtlSecureZeroMemory() function should be used to erase the private data. sha512.c 1423

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