[compiler-rt] [sanitizer_common] fix shadowed ret hiding symbolizer read failures. (PR #209971)

[Paul Kirth via llvm-commits]

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

LGTM. Not sure exactly why I shadowed the existing return value back then, but this seems like a reasonable change. Do make sure someone that works on sanitizers more frequently gets a chance to weigh in before landing. 

https://github.com/llvm/llvm-project/pull/209971