Various fixes for NFD/ndn-cxx 0.7.0

Change-Id: I68e5d4d57d81c3f2e46fc59680cd416b06c8190c
diff --git a/helper/ndn-link-control-helper.cpp b/helper/ndn-link-control-helper.cpp
index 2b46946..b0894d5 100644
--- a/helper/ndn-link-control-helper.cpp
+++ b/helper/ndn-link-control-helper.cpp
@@ -56,7 +56,7 @@
   NS_ASSERT(ndn1 != nullptr && ndn2 != nullptr);
 
   // iterate over all faces to find the right one
-  for (const auto& face : ndn1->getForwarder()->getFaceTable()) {
+  for (const auto& face : ndn1->getFaceTable()) {
     auto transport = dynamic_cast<NetDeviceTransport*>(face.getTransport());
     if (transport == nullptr)
       continue;