Merge pull request #300 from janx/patch-1

remove unnecessary check and invocation in trie

Author: konradkonrad

ethereum/trie.py

@@ -286,10 +286,8 @@ def _delete_child_storage(self, node):
         if node_type == NODE_TYPE_BRANCH:
             for item in node[:16]:
                 self._delete_child_storage(self._decode_to_node(item))
-        elif is_key_value_type(node_type):
-            node_type = self._get_node_type(node)
-            if node_type == NODE_TYPE_EXTENSION:
-                self._delete_child_storage(self._decode_to_node(node[1]))
+        elif node_type == NODE_TYPE_EXTENSION:
+            self._delete_child_storage(self._decode_to_node(node[1]))
 
     def _encode_node(self, node):
         if node == BLANK_NODE: