PVS-Studio warning V547 for DDKSamples

VOID HwFillRateElement(....)
{
  ....
  UCHAR rate[256];
  UCHAR rateNum;
  ....
  if (rateNum == sizeof(rate) / sizeof(UCHAR))
    break;
  ....
}

This suspicious code was found in DDKSamples project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression is always false. The value range of unsigned char type: [0, 255]. hw_mac.c 1971

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/