Merge "Nullability check for termios module" am: 3f44f6b472

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2389832

Change-Id: Ie4fcaf32e4a31a57c1a9da1c068e146f376b68d3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>