ripple/fossil/mount: terminate out-of-bounds Node::find early

Node::find would walk the tree all the way down and to the right if
given an out of bounds index. This doesn't affect the return value
(None), but it does waste some cycles walking down all the way to
the deepest rightmost leaf.

Change-Id: Ic2f72aa96291a25819fc6c3c2f060fe0182a7663

1 files changed, 1 insertions, 1 deletions

diff --git a/ripple/fossil/src/bin/mount.rs b/ripple/fossil/src/bin/mount.rs
index f1bcdde..c9c5955 100644
--- a/ripple/fossil/src/bin/mount.rs
+++ b/ripple/fossil/src/bin/mount.rs
@@ -906,7 +906,7 @@ mod memtree {
 					(0, _) => {
 						break Some(root);
 					}
-					(_, Node::Directory(d)) => {
+					(_, Node::Directory(d)) if index <= d.size => {
 						index -= 1;
 						d
 					}