Fix for double delete in vtkXdmfWriter::~vtkXdmfWriter()
Original issue: 0015390: crash double delete in vtkXdmfWriter::~vtkXdmfWriter()
Removed double delete in vtkXdmfWriter destructor.
Original issue: 0015390: crash double delete in vtkXdmfWriter::~vtkXdmfWriter()
Removed double delete in vtkXdmfWriter destructor.