[clang] [clang-format] Add null-terminated path option (#123921) (PR #123926)

[Owen Pan via cfe-commits]

owenca wrote:

>From #123921, it seems that you only want the new option to work with `--staged`, but should it also work with other options that may print a list of filenames?

https://github.com/llvm/llvm-project/pull/123926