trie: clean up iterator constructors

Make it so each iterator has exactly one public constructor:

- NodeIterators can be created through a method.
- Iterators can be created through NewIterator on any NodeIterator.

1 files changed, 1 insertions, 1 deletions

diff --git a/trie/sync_test.go b/trie/sync_test.go
index acae039cd..6d345ad3f 100644
--- a/trie/sync_test.go
+++ b/trie/sync_test.go
@@ -80,7 +80,7 @@ func checkTrieConsistency(db Database, root common.Hash) error {
 	if err != nil {
 		return nil // // Consider a non existent state consistent
 	}
-	it := NewNodeIterator(trie)
+	it := trie.NodeIterator()
 	for it.Next(true) {
 	}
 	return it.Error()