ffi: release return value when aborting callback.

Continuing on the topic of the previous commit, what if in a
callback an error occurs in the put operation that produces
the return value? In that case we end up clobbering with
the abort_retval or nulling out with zero bytes, either way
potentially leaking memory.

* ffi.c (ffi_closure_dispatch_safe): If the return value type
has release semantics, then as the very first thing, null out
the return value buffer. Then later if a dynamic control
transfer is intercepted, invoke the release semantics before
doing anything to the return value buffer.

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