linting

api/edge/bff/internal/server/callbacksimp/update.go

@@ -49,7 +49,7 @@ func (a *CallbacksAPI) update(r *http.Request, account *model.Account, accessTok
 		if err := a.applySigningSecretMutation(ctx, *account.GetID(), callbackRef, mutation); err != nil {
 			return nil, err
 		}
-		return nil, nil
+		return struct{}{}, nil
 	}); err != nil {
 		a.Logger.Warn("Failed to update callback transaction", zap.Error(err))
 		return response.Auto(a.Logger, a.Name(), err)