[Chicken-hackers] [PATCH] correct size calculation for ffi return types

[lemonboy]

Hello hackers,
I managed to stumble across this nasty compiler bug while trying to figure out
why some code was segfaulting in a FFI stub. It turns out that I forgot to place
a define-foreign-type form before the lines the type was referenced in and the
compiler happily assumed it had size 0 and skipped the generation of the scratch
space buffer.
Here's a simple patch, I'm not too fond of the catch-all case but it shouldn't
be a problem (the `make check` shows no regression).

Cheers,
LemonBoy

0001-Do-not-underallocate-the-scratch-space-for-ffi-retur.patch
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