Clean up part 2

src/day07.rs

@@ -135,8 +135,8 @@ fn solve_part2(input: &[CliOperation]) -> usize {
     let necessary_to_free = 30_000_000 - free_space;
     tree.traverse_post_order(tree.root_node_id().unwrap())
         .unwrap()
-        .filter(|node| node.data().1 >= necessary_to_free)
         .map(|node| node.data().1)
+        .filter(|&size| size >= necessary_to_free)
         .min()
         .unwrap()
 }