[vtkusers] Double error check in vtkImageData?

[Andaharoo]

In vtkImageData, GetScalarPointer(x, y, z) error checks by checking if the
coordinates are in the bounds of the image. It then calls
GetArrayPointer(int[]) which error checks again (with identical code) which
finally returns the results.

What's the reason for this? Is this a mistake? Seems to me the first error
check is not needed.



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