[clang-tools-extra] [NFC] Fixes proposed by code sanitizer. (PR #134138)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

In general, I don't fully understand the scope of this patch. Surely, there's thousands of things that could be improved in the codebase. Which of those belong to this patch? Reviewers can always point out things that could be improved ad infinitum, leading to a patch with lots of unrelated changes. When do we decide that we are done?

https://github.com/llvm/llvm-project/pull/134138