small fixes to ethtype pattern

Change-Id: Ic58c426821952f66aa21bc828d36fd4f83d8da0d
diff --git a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
index fead3bd..e8a131b 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
@@ -19,6 +19,7 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
 import org.apache.commons.collections.ListUtils;
+import org.onlab.packet.EthType;
 import org.onlab.packet.IpAddress;
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.MplsLabel;
@@ -309,6 +310,11 @@
 
         @Override
         public Builder popMpls(int etherType) {
+            return add(Instructions.popMpls(new EthType(etherType)));
+        }
+
+        @Override
+        public Builder popMpls(EthType etherType) {
             return add(Instructions.popMpls(etherType));
         }