Merge "Nullability check for time module." am: b167b90b4c am: 68364d0074

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2580375

Change-Id: Ib40792ce001c407f8aff63556173a8ab15a26f5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>