Fix cert-dcl16-c warnings am: 25c677f7c9 am: 1b068a63db am: a9d8c7ea86

Original change: https://android-review.googlesource.com/c/platform/test/mlts/benchmark/+/1976861

Change-Id: If1c32e5ae35f8a922987789418f0fef723706e1a