comm: Fix sync update prefix initialization

refs: #2399

Change-Id: I35c454e46c0b9552dba2a38b674d1ad3629f8bef
diff --git a/src/nlsr.cpp b/src/nlsr.cpp
index 19bb3cf..cf26a7b 100644
--- a/src/nlsr.cpp
+++ b/src/nlsr.cpp
@@ -128,7 +128,10 @@
   m_fib.setEntryRefreshTime(2 * m_confParam.getLsaRefreshTime());
   m_sequencingManager.setSeqFileName(m_confParam.getSeqFileDir());
   m_sequencingManager.initiateSeqNoFromFile();
+
   m_syncLogicHandler.setSyncPrefix(m_confParam.getChronosyncPrefix().toUri());
+  m_syncLogicHandler.buildUpdatePrefix();
+
   /* Logging start */
   m_confParam.writeLog();
   m_adjacencyList.writeLog();