[compiler-rt] [lsan] Fix free(NULL) interception during initialization (PR #106912)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

this seems to have broken the test on mac: https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-RA/2058/

https://github.com/llvm/llvm-project/pull/106912