Fixing flow rule batches

Problem should now be fixed. Hashing on enums last is a bad
idea because the enum value could be 0.

Change-Id: Ib29e90b393b5285be2807729b52e69b121340f09
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
index 413473f..673773a 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultTrafficSelector.java
@@ -63,7 +63,7 @@
 
     @Override
     public int hashCode() {
-        return Objects.hash(criteria);
+        return criteria.hashCode();
     }
 
     @Override