Merge "Nullability correction for stdlib module." am: 9a3164145c am: 67dcba5c85

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2510535

Change-Id: I1e2e0ff05207ab7c7230f1df45e88a6c18e435cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>