[clang] [Clang][OpenMP] Fix `!isNull() && "Cannot retrieve a NULL type pointer"' fail. (PR #81015)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> The build is failing because of a formatting error which I don't think is related to the changes that I made. Any thoughts as to why it is failing?

That's unrelated, I'll fix it.

https://github.com/llvm/llvm-project/pull/81015