Fix memory leak am: 32f40e1a30 am: 0c6671f06e am: afc2064324

Original change: https://googleplex-android-review.googlesource.com/c/platform/test/mlts/benchmark/+/12468788

Change-Id: I7a85749b29f8a3c3bc1f689ecede353e3abe02f1