[clang] [clang][NFC] Avoid potential null dereferences (PR #127017)

[Balazs Benics via cfe-commits]

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

Im good with the analyzer part, but im not familiar with the other.
That part is not obvious to me, so id suggest an additional reviewer 

https://github.com/llvm/llvm-project/pull/127017