Merge "Nullability check for spawn module" am: 022a139497 am: 56cc28d67f

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2516995

Change-Id: I9e49fd64973ea8ed22e1e8d4e885b061c415073f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>