Merge "Nullability check for msg module." am: a1ff2e6159 am: 6f42b5a3ae

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2539230

Change-Id: Ibbdf41505063269e7c0da8ae8ce104e1585694ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>