[patch #5690] Clean up case code

Update of patch #5690 (project pspp):

             Assigned to:                     blp => jmd                    

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Follow-up Comment #2:

>case_is_null could return bool. 

Thanks, updated.

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

Ditto.

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


No, do you expect them to be arch-sensitive?  (I did test them under
valgrind.)  I'm curious about the answer so I'll delay checking in until I
hear back.

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