Merge "Nullability check for xattr module." am: 0f371ff845 am: ace1448647 am: 3dbe31412e am: 29fae2f537 am: 8bfd947f3e

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2597870

Change-Id: I02c91b56fec72e1d00c1b18199cda4d8329c147b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>