Remove redundant field initialization

transport/src/test/java/io/netty/channel/local/LocalTransportThreadModelTest2.java

@@ -129,7 +129,7 @@ public class LocalTransportThreadModelTest2 {
     class LocalHander extends ChannelInboundMessageHandlerAdapter<Object> {
         private final String name;
 
-        public volatile ChannelFuture lastWriteFuture = null;
+        public volatile ChannelFuture lastWriteFuture;
 
         public AtomicInteger count = new AtomicInteger(0);
 
@@ -150,4 +150,4 @@ public class LocalTransportThreadModelTest2 {
             count.incrementAndGet();
         }
     }
-}
+}