Correct the map size before accessing in VTS test am: 72b8a3a7ce am: c5c897230e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3411437

Change-Id: Ic095ed81cde09b825a7037e0bfe49ea069db5b26
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>