PVS-Studio warning V597 for samba

static void
calc(struct md2 *m, const void *v)
{
  unsigned char x[48], L;
  ....
  memset(x, 0, sizeof(x));
}

This suspicious code was found in samba 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. md2.c 91

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/