fix compilation error in amqp module

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1411695 13f79535-47bb-0310-9956-ffa450edef68

activemq-amqp/src/main/java/org/apache/activemq/transport/amqp/transform/DroppingWritableBuffer.java

@@ -88,4 +88,9 @@ public class DroppingWritableBuffer implements WritableBuffer
         pos += payload.remaining();
         payload.position(payload.limit());
     }
+
+    @Override
+    public int limit() {
+        return Integer.MAX_VALUE;
+    }
 }