Merge "Nullability check for shm module." am: 374d2f1be0 am: 1467fed1d8 am: e26c611a2f am: 26d85c44e0 am: f03ef7bf99 am: 1131063fb0

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2601525

Change-Id: I4f5c3b8ee5fd12fbb0edc1940e7ec69a4f193e3f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>