[libc-commits] [libc] Add missed variable change from a refactor (PR #193684)

[Jeff Bailey via libc-commits]

kaladron wrote:

This had been approved in https://github.com/llvm/llvm-project/pull/184163 but this also got rolled back when the PR was rolled back, so peeling this out.

https://github.com/llvm/llvm-project/pull/193684