[tz] [PROPOSED 1/7] Avoid undefined behavior if no Link lines

[Garrett Wollman]

<<On Thu, 27 Oct 2022 07:38:42 +0100, "Clive D.W. Feather via tz" <tz at iana.org> said:

> Why not? You're assuming that NULL is represented by 32 or 64 zero bits [1].
> That's not what all computers do. Unusual architectures may do something
> completely different

I don't want to speak for Paul, but I think it is a true statement
that such an "unusual architecture" would be unsaleable today.  Even
CHERI uses all-bits-zero-and-untagged as a null pointer.

-GAWollman