fw: attach PIT token upon CS hit

refs #5090

Change-Id: I496ec0865dc4b8dfb35efe2be8453eda96a2ea9b
diff --git a/daemon/fw/forwarder.cpp b/daemon/fw/forwarder.cpp
index 8ab209a..adfa3e1 100644
--- a/daemon/fw/forwarder.cpp
+++ b/daemon/fw/forwarder.cpp
@@ -32,6 +32,7 @@
 #include "common/logger.hpp"
 #include "table/cleanup.hpp"
 
+#include <ndn-cxx/lp/pit-token.hpp>
 #include <ndn-cxx/lp/tags.hpp>
 
 namespace nfd {
@@ -225,6 +226,7 @@
   ++m_counters.nCsHits;
 
   data.setTag(make_shared<lp::IncomingFaceIdTag>(face::FACEID_CONTENT_STORE));
+  data.setTag(interest.getTag<lp::PitToken>());
   // FIXME Should we lookup PIT for other Interests that also match the data?
 
   pitEntry->isSatisfied = true;