Merge "Correct nullability check for pthread_create()" into main am: 910f91a8f9 am: 3ebf522591

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

Change-Id: I3262472b139320744a58f2987b9a7cc9c65e991f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>