chore: address previous review comments

apps/emqx_schema_registry/include/emqx_schema_registry.hrl

@@ -32,7 +32,9 @@
 -record(serde, {
     name :: schema_name(),
     type :: serde_type(),
-    eval_context :: term()
+    eval_context :: term(),
+    %% for future use
+    extra = []
 }).
 -type serde() :: #serde{}.
 

apps/emqx_schema_registry/src/emqx_schema_registry.erl

@@ -312,8 +312,9 @@ ensure_serde_absent(Name) when not is_binary(Name) ->
 ensure_serde_absent(Name) ->
     case get_serde(Name) of
         {ok, Serde} ->
+            ok = emqx_schema_registry_serde:destroy(Serde),
             _ = ets:delete(?SERDE_TAB, Name),
-            ok = emqx_schema_registry_serde:destroy(Serde);
+            ok;
         {error, not_found} ->
             ok
     end.