PVS-Studio warning V560 for LibRaw

void CLASS identify()
{
  ....
  if (!load_raw && (maximum = 0xfff))
  ....
}

This suspicious code was found in LibRaw project by PVS-Studio static code analyzer.
Warning message is:
V560 A part of conditional expression is always true: ((imgdata.color.maximum) = 0xfff). dcraw_common.cpp 8496

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