PVS-Studio warning V512 for MTASA

unsigned char m_buffer[64];

void CMD5Hasher::Finalize ( void )
{
  ....
  // Zeroize sensitive information
  memset ( m_buffer, 0, sizeof (*m_buffer) );
  ....
}

This suspicious code was found in MTASA project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer 'm_buffer'. sharedutil.hash.hpp 216

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