PVS-Studio warning V547 for ReactOS

typedef unsigned short WORD;
WORD Id;

static LONG
LdrpCompareResourceNames_U(....)
{
  /* Fail if ResourceName2 is an ID */
  if (Entry->Id <= USHRT_MAX) return -1;
  ....
}

This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression 'Entry->Id <= 0xffff' is always true. The value range of unsigned short type: [0, 65535]. res.c 312

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/