[libc-commits] [libc] [libc] Properly clear out errno in tests that check its value. (PR #131650)

[Alexey Samsonov via libc-commits]

vonosmas wrote:

We may potentially do this _also_ in a TEST harness somehow (in the framework), though I'm not sure it wouldn't violate the principle of least surprise.

https://github.com/llvm/llvm-project/pull/131650