[clang-tools-extra] [clang-tidy] Fix redundant-branch-condition false positive in loops (PR #225827)

[Donát Nagy via cfe-commits]

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

The change looks good to me, but please wait for a review by one of the clang-tidy maintainers who were added as reviewers (or another experienced developer) before merging it. 

https://github.com/llvm/llvm-project/pull/225827