[ONOS-7993] fix the little bug in TAPI rest interface.

Change-Id: Ia82dc51cc2b537912c08fe656698837706a4598c
diff --git a/drivers/odtn-driver/src/main/java/org/onosproject/drivers/odtn/tapi/TapiDeviceDescriptionDiscovery.java b/drivers/odtn-driver/src/main/java/org/onosproject/drivers/odtn/tapi/TapiDeviceDescriptionDiscovery.java
index ab0a986..f2f4739 100644
--- a/drivers/odtn-driver/src/main/java/org/onosproject/drivers/odtn/tapi/TapiDeviceDescriptionDiscovery.java
+++ b/drivers/odtn-driver/src/main/java/org/onosproject/drivers/odtn/tapi/TapiDeviceDescriptionDiscovery.java
@@ -44,7 +44,6 @@
 import java.util.List;
 
 import static com.google.common.base.Preconditions.checkNotNull;
-import static org.onosproject.drivers.odtn.tapi.TapiDeviceHelper.CONTEXT;
 import static org.onosproject.drivers.odtn.tapi.TapiDeviceHelper.LAYER_PROTOCOL_NAME;
 import static org.onosproject.drivers.odtn.tapi.TapiDeviceHelper.MC_POOL;
 import static org.onosproject.drivers.odtn.tapi.TapiDeviceHelper.MEDIA_CHANNEL_SERVICE_INTERFACE_POINT_SPEC;
@@ -133,7 +132,7 @@
          when connectivity services will be sent to OLS Controller.
          */
         DefaultAnnotations.Builder annotations = DefaultAnnotations.builder();
-        Iterator<JsonNode> iter = tapiContext.get(CONTEXT).get(SERVICE_INTERFACE_POINT).iterator();
+        Iterator<JsonNode> iter = tapiContext.get(SERVICE_INTERFACE_POINT).iterator();
         while (iter.hasNext()) {
             JsonNode sipAttributes = iter.next();
             if (checkValidEndpoint(sipAttributes)) {