Use long literal to shorten codes

Change-Id: I7a6c4e32b98aa37ce862ab94cab246889aea986a
diff --git a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
index 108dbf8..5ec5d7b 100644
--- a/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
+++ b/providers/openflow/flow/src/main/java/org/onosproject/provider/of/flow/impl/FlowModBuilder.java
@@ -125,7 +125,7 @@
         this.factory = factory;
         this.flowRule = flowRule;
         this.selector = flowRule.selector();
-        this.xid = xid.orElse((long) 0);
+        this.xid = xid.orElse(0L);
 
     }