[libunwind] [libunwind] Fix an inconsistent indentation (NFC) (PR #72314)

[Alexander Richardson via cfe-commits]

arichardson wrote:

> > Making it consistent is good, but it sounds like we should update the .clang-format config file or reformat this whole file to not be indented.
> 
> I'm not sure what the clang-format policy for libunwind is. How about landing this as is and updating `.clang-format` or excluding this file as a follow-up, in a way you and other libunwind maintainers think is appropriate?

Sorry if that wasn't obvious, I think your change should be merged. I just noticed that the current style does not match the configured one which should eventually be fixed as a follow up change.

https://github.com/llvm/llvm-project/pull/72314