Revert invalid fix

src/main/java/org/jboss/netty/util/ThreadNameDeterminer.java

@@ -42,7 +42,7 @@ public interface ThreadNameDeterminer {
     ThreadNameDeterminer CURRENT = new ThreadNameDeterminer() {
         public String determineThreadName(String currentThreadName,
                 String proposedThreadName) throws Exception {
-            return currentThreadName;
+            return null;
         }
     };