table: Fixing Pit::erase crash if the Interest name contains implicit digest

Change-Id: I471023fc23ffaebe04d9668426b4c1b03e4973ac
Refs: #3608
diff --git a/daemon/table/pit.cpp b/daemon/table/pit.cpp
index 12a21bd..ae5a5cd 100644
--- a/daemon/table/pit.cpp
+++ b/daemon/table/pit.cpp
@@ -113,7 +113,7 @@
 void
 Pit::erase(shared_ptr<pit::Entry> pitEntry)
 {
-  shared_ptr<name_tree::Entry> nameTreeEntry = m_nameTree.get(*pitEntry);
+  shared_ptr<name_tree::Entry> nameTreeEntry = pitEntry->m_nameTreeEntry;
   BOOST_ASSERT(static_cast<bool>(nameTreeEntry));
 
   nameTreeEntry->erasePitEntry(pitEntry);