src: onFaceEventNotification only proceed if face id was zero or updated

refs: #5010

Change-Id: Ie5b1f8a5ca2a372890a9ef2a28dc00e1a7c0a366
diff --git a/src/route/fib.cpp b/src/route/fib.cpp
index 7d08e12..9ee14c7 100644
--- a/src/route/fib.cpp
+++ b/src/route/fib.cpp
@@ -199,8 +199,7 @@
 
 void
 Fib::registerPrefix(const ndn::Name& namePrefix, const ndn::FaceUri& faceUri,
-                    uint64_t faceCost,
-                    const ndn::time::milliseconds& timeout,
+                    uint64_t faceCost, const ndn::time::milliseconds& timeout,
                     uint64_t flags, uint8_t times)
 {
   uint64_t faceId = m_adjacencyList.getFaceId(ndn::FaceUri(faceUri));