[clang] [clang] Fix null buffer dereference in InitializeFileRemapping (PR #201289)

[Krisitan Erik Olsen via cfe-commits]

Kristianerik wrote:


Could you point me to which test file would be most appropriate? And are you saying the null buffer case is impossible by construction, or just unlikely?

https://github.com/llvm/llvm-project/pull/201289