PVS-Studio warning V528 for VTK

int vtkBYUReader::RequestData(....)
{
  ...
  if (this->GeometryFileName == NULL ||
      this->GeometryFileName == '\0')
  ...
}

This is what should have been written here: this->GeometryFileName[0] == '\0'

This suspicious code was found in VTK project by PVS-Studio static code analyzer.
Warning message is:
V528 It is odd that pointer to 'char' type is compared with the '\0' value. Probably meant: *this->GeometryFileName == '\0'. vtkIO vtkbyureader.cxx 109

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/