Support to specify Ofdpa extension through REST API

Code clean up for Nicira extension codec.

Change-Id: Idbbfd1ca12b01d46e3b6c90ebce39e6a6605cb58
diff --git a/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraSetNshSpiCodec.java b/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraSetNshSpiCodec.java
index e6c209d..a2cd7a3 100644
--- a/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraSetNshSpiCodec.java
+++ b/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraSetNshSpiCodec.java
@@ -53,8 +53,6 @@
 
         NshServicePathId pathId = NshServicePathId.of(servicePathIdInt);
 
-        NiciraSetNshSpi niciraSetNshSpi = new NiciraSetNshSpi(pathId);
-
-        return niciraSetNshSpi;
+        return new NiciraSetNshSpi(pathId);
     }
 }