[GH-10866] Preferrence.Save - Remove preference length return arg (#10962)

app/user.go

@@ -310,7 +310,7 @@ func (a *App) createUser(user *model.User) (*model.User, *model.AppError) {
 	}
 
 	pref := model.Preference{UserId: ruser.Id, Category: model.PREFERENCE_CATEGORY_TUTORIAL_STEPS, Name: ruser.Id, Value: "0"}
-	if _, err := a.Srv.Store.Preference().Save(&model.Preferences{pref}); err != nil {
+	if err := a.Srv.Store.Preference().Save(&model.Preferences{pref}); err != nil {
 		mlog.Error(fmt.Sprintf("Encountered error saving tutorial preference, err=%v", err.Message))
 	}