hw2: guard against invalid cb_handle am: e149ab0bbc am: 533536d0df am: 3e6a1c6316 am: 62ca3b453f

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

Change-Id: Ie60d833cb8c804f308410464119fa9ac9acd887b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>