From b1c9bb63d7dcbf4237f7ec4a591c35dba3af908b Mon Sep 17 00:00:00 2001
From: zmstone <zmstone@gmail.com>
Date: Tue, 26 Mar 2024 13:20:48 +0100
Subject: [PATCH] chore: delete dead code

hocon schema validator never validates 'undefined'
---
 apps/emqx/src/emqx_schema.erl | 2 --
 1 file changed, 2 deletions(-)

diff --git a/apps/emqx/src/emqx_schema.erl b/apps/emqx/src/emqx_schema.erl
index 4311e100e..427df5db0 100644
--- a/apps/emqx/src/emqx_schema.erl
+++ b/apps/emqx/src/emqx_schema.erl
@@ -1748,8 +1748,6 @@ fields("client_attrs_init") ->
             })}
     ].
 
-restricted_string(undefined) ->
-    undefined;
 restricted_string(Str) ->
     case emqx_utils:is_restricted_str(Str) of
         true -> ok;