Fix -Wunused-variable compiler warning am: 2868fcfab8

Original change: https://android-review.googlesource.com/c/device/google/trout/+/2861965

Change-Id: Ib251f67a77d66bd076ef00d9aeafb71d42a987ae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>