[patch #5690] Clean up case code

[John Darrington]

Update of patch #5690 (project pspp):

                  Status:   Ready For Test/Review => Works For Me           
             Assigned to:                     jmd => blp                    

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Follow-up Comment #1:

case_is_null could return bool.

You need to visit each of the changed files in emacs and do M-x
copyright-update

I wonder if you've tested these changes on ix64 or any other architectures?

Otherwise no problems.

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