set correct default value to sequenceNumber for response(IOT-615)

Change-Id: Iaf4027cb4f379d3e5dff04d06cbd5d4fb38d23e0
Signed-off-by: sonu1.yadav <sonu1.yadav@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1717Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>

resource/csdk/stack/src/ocstack.c

@@ -1048,6 +1048,7 @@ void HandleCAResponses(const CAEndpoint_t* endPoint, const CAResponseInfo_t* res
             OC_LOG(INFO, TAG, PCF("Calling into application address space"));
 
             OCClientResponse response = {};
+            response.sequenceNumber = OC_OBSERVE_NO_OPTION;
             CopyEndpointToDevAddr(endPoint, &response.devAddr);
             FixUpClientResponse(&response);
             response.resourceUri = responseInfo->info.resourceUri;