PVS-Studio warning V597 for eMulePlus

static void MD5Transform(UINT4 state[4],
                         unsigned char block[64])
{
  UINT4 a = state[0], b = state[1], c = state[2],
        d = state[3], x[16];
  ...
  /* Zeroize sensitive information */
  memset(x, 0, sizeof(x));
}

This suspicious code was found in eMulePlus project by PVS-Studio static code analyzer.
Warning message is:
V597 The compiler could delete the 'memset' function call, which is used to flush 'x' buffer. The RtlSecureZeroMemory() function should be used to erase the private data.  emule md5sum.cpp 263

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