PVS-Studio warning V547 for VTK

int vtkNetCDFCFReader::RequestDataObject(....)
{
  if (    (preferredDataType != VTK_IMAGE_DATA)
       || (preferredDataType != VTK_RECTILINEAR_GRID) )
  {
    vtkWarningMacro("You have set the OutputType to a data "
                    "type that cannot fully represent the "
                    "topology of the data. Some of the "
                    "topology will be ignored.");
  }
}

This suspicious code was found in VTK project by PVS-Studio static code analyzer.
Warning message is:
V547 Expression is always true. Probably the '&&' operator should be used here. vtkIO vtknetcdfcfreader.cxx 838

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