Remove confusing macros.

The upper-case macro `VAR` casts the lower-case variable `var` to an
expected type, but that usage obfuscates the variables to the casual
reader. This is especially prevalent in the allocation function in which
`var` is the correct type already, so both `var` and `VAR` are valid
*and* in use.

In any case, for those functions that don't obtain `var` in the correct
type from their parameters, it's much simpler to just case once at the
beginning.

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