[clang] Fix an error introduced in #138518 (PR #142988)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

1 nit, else this LGTM. @cor3ntin should have a quick look, but I'm happy with this.

Thank you so much!

https://github.com/llvm/llvm-project/pull/142988