hal: 2 commits: fix up introspection bits

[Holger Macht]

On Thu 10. May - 23:37:00, Holger Macht wrote:
[...]
> exactly to express this in the xml section. Suggestions welcome. Appended
> patch just removes the return value information from the c file.

Of course forgot to attach something. Here we go...

Regards,
	Holger
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