hw2: guard against invalid cb_handle am: e149ab0bbc am: 533536d0df am: 3e6a1c6316 am: 62ca3b453f am: 04588e2471 am: 28097ae7b9

Original change: https://googleplex-android-review.googlesource.com/c/device/generic/goldfish-opengl/+/26050304

Change-Id: Ie9a43f8bb535494a8cf693f5ba3f68f5032af5e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>