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

[Ralph Becket]

Zoltan Somogyi, Monday, 11 September 2006:
> I'd say it should stay turned on. The original writer of the code may know
> what he/she meant, but later readers cannot assume this (unless the writer
> puts in a comment to that effect, but then renaming would accomplish that
> objective even more clearly).

Lambdas are almost always small; I have no problem recognizing
shadowing.

On the other hand, renaming often makes code less readable (e.g., what
is a good renaming for the IO state in a lambda?)

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