[PATCH] Small cleanup to get rid of a few compilation warnings

[Peter Bex]

Hi all,

Here's a simple patch.  Found while reviewing Megane's patch for
improving line number reporting in [ei]r-macro-transformer; this
recompiled expand.scm which rubbed those compiler warnings in my
face.

I think having these redundant predicate checks in the expander was
a temporary measure during the transition from 5.0 to 5.1, but now
even if we compile CHICKEN with 5.1 or 5.2 this is not needed at all
any more.  It might not even have been needed when it was introduced,
but I'm not 100% sure.

Cheers,
Peter

0001-Minor-cleanup.patch
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