[vtkusers] Re-using smart pointers as both input and output

[Utkarsh Ayachit]

>
>
> Is it okay to reassign a smart pointer like that after using it as the
> input
> to an algorithm?
>

Yes. Except you can't do `delaunay->SetInputConnection(input)`, you'll need
to use `delaunay->SetInputDataObject(input);`.

Utkarsh
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