Various fixes for NFD/ndn-cxx 0.7.0

Change-Id: I68e5d4d57d81c3f2e46fc59680cd416b06c8190c
diff --git a/helper/ndn-stack-helper.cpp b/helper/ndn-stack-helper.cpp
index cf60551..af9c055 100644
--- a/helper/ndn-stack-helper.cpp
+++ b/helper/ndn-stack-helper.cpp
@@ -391,7 +391,7 @@
     if (ndn == nullptr)
       continue;
 
-    for (auto& face : ndn->getForwarder()->getFaceTable()) {
+    for (auto& face : ndn->getFaceTable()) {
       auto transport = dynamic_cast<NetDeviceTransport*>(face.getTransport());
       if (transport == nullptr)
         continue;