Merge "Correct nullability check for pthread_create()" into main am: 910f91a8f9

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3261400

Change-Id: I578a1b8bb86b70a3803125ed424b3da5858180ed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>