[clang-tools-extra] [clang-tidy] Fix invalid fixit from modernize-use-ranges for nullptr used with std::unique_ptr (PR #127162)

[Baranov Victor via cfe-commits]

vbvictor wrote:

> I‘m sorry for requesting approval again. But I'm really confused that should I make sure my branch is alwasy up-to-date?

Rebase from `main` periodically, at least before merge.
It's just to make sure that there are no merge conflicts.

https://github.com/llvm/llvm-project/pull/127162