upd bench

app/benches/db_bench.rs

@@ -79,9 +79,8 @@ fn db_read(c: &mut Criterion) {
                 let reader: Reader<TestData> = Reader::new(&tmpfile, 2048).expect("new reader");
                 reader
             },
-            |mut reader| {
+            |reader| {
-                let mut reader_iter = reader.iter();
+                for item in reader {
-                while let Some(item) = reader_iter.next() {
                     drop(item);
                 }
             },