[serialize] Don't free object-pool in reset()

src/hb-pool.hh

@@ -35,15 +35,12 @@ template <typename T, unsigned ChunkLen = 16>
 struct hb_pool_t
 {
   hb_pool_t () : next (nullptr) {}
-  ~hb_pool_t () { fini (); }
-
-  void fini ()
+  ~hb_pool_t ()
   {
     next = nullptr;
 
-    for (chunk_t *_ : chunks) hb_free (_);
-
-    chunks.fini ();
+    for (chunk_t *_ : chunks)
+      hb_free (_);
   }
 
   T* alloc ()

src/hb-serialize.hh

@@ -194,7 +194,6 @@ struct hb_serialize_context_t
       current = current->next;
       _->fini ();
     }
-    object_pool.fini ();
   }
 
   bool in_error () const { return bool (errors); }