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/NiciraMatchNshSiCodec.java b/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSiCodec.java
index e6ca4a9..069086b 100644
--- a/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSiCodec.java
+++ b/drivers/default/src/main/java/org/onosproject/driver/extensions/codec/NiciraMatchNshSiCodec.java
@@ -52,8 +52,6 @@
                 NSH_SERVICE_INDEX + MISSING_MEMBER_MESSAGE).asInt();
         NshServiceIndex nshSi = NshServiceIndex.of(nshSiShort);
 
-        NiciraMatchNshSi niciraMatchNshSi = new NiciraMatchNshSi(nshSi);
-
-        return niciraMatchNshSi;
+        return new NiciraMatchNshSi(nshSi);
     }
 }