communication: improve constness

Change-Id: Iabc5093d3c8e84540ddef4f6f2ff768dd9f3d0da
refs: #4472
diff --git a/src/communication/sync-logic-handler.cpp b/src/communication/sync-logic-handler.cpp
index 01e4bd3..6b392af 100644
--- a/src/communication/sync-logic-handler.cpp
+++ b/src/communication/sync-logic-handler.cpp
@@ -43,7 +43,8 @@
   }
 };
 
-SyncLogicHandler::SyncLogicHandler(ndn::Face& face, const IsLsaNew& isLsaNew, ConfParameter& conf)
+SyncLogicHandler::SyncLogicHandler(ndn::Face& face, const IsLsaNew& isLsaNew,
+                                   const ConfParameter& conf)
   : onNewLsa(ndn::make_unique<OnNewLsa>())
   , m_syncFace(face)
   , m_isLsaNew(isLsaNew)
@@ -156,7 +157,6 @@
     BOOST_THROW_EXCEPTION(SyncLogicHandler::Error("Cannot publish routing update; SyncSocket does not exist"));
   }
 
-
   switch (type) {
   case Lsa::Type::ADJACENCY:
     publishSyncUpdate(m_adjLsaUserPrefix, seqNo);