Make UFFI:FOREIGN-ENCODED-OCTET-COUNT evaluate its arguments.
Make UFFI:FOREIGN-ENCODED-OCTET-COUNT evaluate its arguments.

Previously, it was returning an expression, acting like a macro.

Thanks to Nathan Bird for spotting this bug

3b/cffi,dkochmanski/cffi,akovalenko/cffi,dkochmanski/cffi,stassats/cffi,stassats/cffi,stassats/cffi,cffi/cffi,3b/cffi,akovalenko/cffi,attila-lendvai/cffi,akovalenko/cffi,3b/cffi,mcna/cffi,dkochmanski/cffi,cffi/cffi,cffi/cffi,attila-lendvai/cffi,mcna/cffi