Use C-style casts instead of compare to 0, to convert hb_bool_t to bool
diff --git a/src/hb-common.cc b/src/hb-common.cc
index 176da8d..710b36e 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -521,7 +521,7 @@
     }
   }
   hb_user_data_item_t item = {key, data, destroy};
-  bool ret = !!items.replace_or_insert (item, lock, replace != 0);
+  bool ret = !!items.replace_or_insert (item, lock, (bool) replace);
 
   return ret;
 }