Correct the map size before accessing in VTS test am: 72b8a3a7ce am: c5c897230e am: fd206dd85f

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

Change-Id: If1dfe5d9dcaa4df2aee37acc0dcf82db2f3a158a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>