PVS-Studio warning V519 for VirtualBox

static void
vbcppProcessSkipWhiteAndEscapedEol(PSCMSTREAM pStrmInput)
{
  ....
  if (ch == '\r' || ch == '\n')
  {
    ....
  }
  else if (RT_C_IS_SPACE(ch))
  {
    ch = chPrev;                        //<==
    ch = ScmStreamGetCh(pStrmInput);    //<==
    Assert(ch == chPrev);
  }
  else
    break;
  ....
}

It is logical to assume that the operands of the assignment operator are swapped by mistake and it is the previous character that should be saved in this code: chPrev = ch;

This suspicious code was found in VirtualBox project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'ch' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 1135, 1136. vboxcpp.cpp 1136

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/