MDEV-14429 sql_safe_updates in my.cnf not work

mysql-test/main/mysqld--help.result

@@ -1209,6 +1209,10 @@ The following specify which files/extra groups are read (specified before remain
  NO_AUTO_CREATE_USER, HIGH_NOT_PRECEDENCE, 
  NO_ENGINE_SUBSTITUTION, PAD_CHAR_TO_FULL_LENGTH, 
  EMPTY_STRING_IS_NULL, SIMULTANEOUS_ASSIGNMENT
+ --sql-safe-updates  If set to 1, UPDATEs and DELETEs need either a key in the
+ WHERE clause, or a LIMIT clause, or else they will
+ aborted. Prevents the common mistake of accidentally
+ deleting or updating every row in a table.
  --stack-trace       Print a symbolic stack trace on failure
  (Defaults to on; use --skip-stack-trace to disable.)
  --standard-compliant-cte 
@@ -1664,6 +1668,7 @@ slow-launch-time 2
 slow-query-log FALSE
 sort-buffer-size 2097152
 sql-mode STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
+sql-safe-updates FALSE
 stack-trace TRUE
 standard-compliant-cte TRUE
 stored-program-cache 256

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -4799,7 +4799,7 @@ NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
-COMMAND_LINE_ARGUMENT	NULL
+COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	SQL_SELECT_LIMIT
 SESSION_VALUE	18446744073709551615
 GLOBAL_VALUE	18446744073709551615

sql/sys_vars.cc

@@ -4119,7 +4119,7 @@ static Sys_var_bit Sys_safe_updates(
        "sql_safe_updates", "If set to 1, UPDATEs and DELETEs need either a key in "
        "the WHERE clause, or a LIMIT clause, or else they will aborted. Prevents "
        "the common mistake of accidentally deleting or updating every row in a table.",
-       SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_SAFE_UPDATES,
+       SESSION_VAR(option_bits), CMD_LINE(OPT_ARG), OPTION_SAFE_UPDATES,
        DEFAULT(FALSE));
 
 static Sys_var_bit Sys_buffer_results(