Merge "Nullability check for shm module." am: 374d2f1be0 am: 1467fed1d8

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

Change-Id: I7bacd4f379ea438c73aab4f970c093ef3dfe20ae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>