rib-manager: deleting expired entries from the rib and fib.

refs #1326
Change-Id: I865bff19da766560f920b1818bdf3eaa91e7dbb1
diff --git a/rib/rib.hpp b/rib/rib.hpp
index 89cad32..c555d21 100644
--- a/rib/rib.hpp
+++ b/rib/rib.hpp
@@ -55,7 +55,7 @@
   const_iterator
   find(const Name& prefix) const;
 
-  shared_ptr<FaceEntry>
+  FaceEntry*
   find(const Name& prefix, const FaceEntry& face) const;
 
   void