[clang] [clang] Fix unexpected warnings after a01307a (PR #75591)

[Mariya Podchishchaeva via cfe-commits]

Fznamznon wrote:

> Ok, ideally this should be reviewed by someone who knows the code but it LGTM.

I know, but a lot of folks are now on vacation already. The change is not complicated, so I'll probably wait till green pre-commit, then leave it for post-commit review to resolve the issue.

https://github.com/llvm/llvm-project/pull/75591