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

[Paul Eggert]

On 2022-10-26 07:54, Jonathan Leffler wrote:
> There's no need to sort arrays of size 0 or 1.

Good point, thanks. I installed the first attached patch to do that. The 
second patch just fixes spacing as a style matter.

Although there's a similar issue with bsearch and arrays with zero 
members, I didn't add a size-zero check there, as the base pointer must 
be nonnull when bsearch is called, the C standard says that bsearch does 
the right thing if you give it a valid non-null pointer and a zero 
nmemb, and I didn't see much point to adding an optimization there. 
Whereas with qsort, the base pointer might be null so the code must 
check for either a null pointer or size zero anyway, so why not check 
for size 1 as that's nearly as cheap and arguably clearer?
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