complete task cleanup, likely not necessary but looks better

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1151714 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/AugmentReference.java

@@ -89,6 +89,7 @@ public class AugmentReference extends Task implements TypeAdapter {
             RuntimeConfigurable wrapper = getWrapper();
             wrapper.setAttribute("id", id);
             wrapper.setElementTag(getTaskName());
+            id = null;
         }
     }