Merge "Add null check for mNetwork update" into tm-dev am: f573f94fec

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Iwlan/+/18137005

Change-Id: Iecfc79b66886e87a9da874f10bc3ea046469d11b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>