Removed unnecessary attachment() calls

src/main/java/org/jboss/netty/channel/socket/nio/NioDatagramWorker.java

@@ -424,7 +424,7 @@ class NioDatagramWorker implements Runnable {
         }
 
         if (failure) {
-            close(key);
+            close(channel, succeededFuture(channel));
             return false;
         }
 

src/main/java/org/jboss/netty/channel/socket/nio/NioWorker.java

@@ -354,7 +354,7 @@ class NioWorker implements Runnable {
         }
 
         if (ret < 0 || failure) {
-            close(k);
+            close(channel, succeededFuture(channel));
             return false;
         }