PVS-Studio warning V567 for nss

PK11SlotList *
PK11_GetAllTokens(....)
{
  ....
  int j = 0;
  PRInt32 waste[16];
  ....
#if defined( XP_WIN32 )
  /* This is works around some horrible cache/page thrashing
  ** problems on Win32.  Without this, this loop can take up to
  ** 6 seconds at 100% CPU on a Pentium-Pro 200.  The thing this
  ** changes is to increase the size of the stack frame and
  ** modify it. Moving the loop code itself seems to have no
  ** effect. Dunno why this combination makes a difference,
  ** but it does.
  */
  waste[j & 0xf] = j++;
#endif
  ....
}

This suspicious code was found in nss project by PVS-Studio static code analyzer.
Warning message is:
V567 Undefined behavior. The 'j' variable is modified while being used twice between sequence points. pk11slot.c 1926

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