[compiler-rt] Fixed a possible null dereference problem #77737 (PR #78984)

[Chris Apple via llvm-commits]

cjappl wrote:

Closing. 

The title doesn't match the work done. The work done seems to change the meaning of the function. There is no description.

If you think this is a mistake, feel free to resubmit with some more context.

https://github.com/llvm/llvm-project/pull/78984