remove unnecessary .into()

src/rstd/collections/avl.rs

@@ -145,8 +145,7 @@ impl<'a, Ctx: Context<'a>, F: Factory<'a, Ctx>> Factory<'a, Ctx> for AvlNodeFact
         let key = self
             .0
             .deserialize(deserializer, resolver.clone(), addresses)
-            .map_err(AvlError::Key)?
-            .into();
+            .map_err(AvlError::Key)?;
         Ok(AvlNode { l, r, key })
     }