[m-rev.] trivial diff: avoid a warning in samples/rot13

[Ralph Becket]

Julien Fischer, Monday, 11 September 2006:
> 
> Estimated hours taken: 0
> Branches: main, release
> 
> samples/rot13/rot13_ralph.m:
> 	Avoid a warning about a variable having overlapping scopes.

I hate that warning.  No other language with lambdas that I'm aware of
thinks users can't understand local names shadowing outer-scope names.
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