[clang] [Sema] Fix crash in __builtin_dump_struct with -Werror -Wformat-pedantic (PR #212377)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

This looks good, but looking at the original mistake it might be worth looking for any similar uses of `hasErrorOccurred` in the related code and seeing if you can trigger those paths as well (it would be nice if there was some structural fix for this, but that's unlikely to be a task for this PR :D )

https://github.com/llvm/llvm-project/pull/212377