message: [benchmarks] fix unused result check.
diff: @@ -61,7 +61,7 @@ fn accumulator_append(c: &mut Criterion) {
  .unwrap()
  },
  |bench| {
  - bench.append(&leaves);
  + bench.append(&leaves).unwrap();
  bench.flush().unwrap();
  },
  BatchSize::LargeInput,
  