resbin: don't pass NULL as printf %s arg

[ASSI]

Alan Modra writes:
> Commit c6c8d0b82175 went completely the wrong way.  "key" needs to be
> NULL as that reads a different type of data.

What are the odds of a 2.45.1 containing this patch appearing soon-ish?
I was preparing a release for Cygwin and I need to decide whether to
wait or just carry that as a patch.


Regards,
Achim.
-- 
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