more silencing fixes

src/hb-ot-cff2-table.hh

@@ -48,7 +48,7 @@ struct CFF2VariationStore
 
   inline bool serialize (hb_serialize_context_t *c, const CFF2VariationStore *varStore)
   {
-    TRACE_SANITIZE (this);
+    TRACE_SERIALIZE (this);
     unsigned int size_ = varStore->get_size ();
     CFF2VariationStore *dest = c->allocate_size<CFF2VariationStore> (size_);
     if (unlikely (dest == nullptr)) return_trace (false);

src/hb-subset-cff2.cc

@@ -144,6 +144,7 @@ struct CFF2PrivateDict_OpSerializer : OpSerializer
 
 struct subset_plan {
   inline subset_plan (void)
+    : final_size (0)
   {
     subset_charstrings.init ();
     private_off_and_size_pairs.init ();