Fixed bench tests

kernel/benches/dynamic_buffer_bench.rs

@@ -21,7 +21,8 @@ fn criterion_benchmark(c: &mut Criterion) {
     c.bench_function("Merge several large arrays", |b| {
         let mut buffer = DynamicBuffer::new();
 
-        for _n in 1..=100 {
+        // 5 here is fine, because it is sampled a lot with criterion
+        for _n in 1..=5 {
             buffer.add(black_box(vec![0u8; 1024 * 1024]), black_box(1024 * 1024));
         }