erofs: remove unused enum type

Opt_err is not used in EROFS, we can remove it.

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Gao Xiang <xiang@kernel.org>
Link: https://lore.kernel.org/r/20250429075056.689570-1-lihongbo22@huawei.com
Signed-off-by: Gao Xiang <xiang@kernel.org>

Author: Hongbo Li

fs/erofs/super.c

@@ -357,7 +357,6 @@ static void erofs_default_options(struct erofs_sb_info *sbi)
 enum {
 	Opt_user_xattr, Opt_acl, Opt_cache_strategy, Opt_dax, Opt_dax_enum,
 	Opt_device, Opt_fsid, Opt_domain_id, Opt_directio,
-	Opt_err
 };
 
 static const struct constant_table erofs_param_cache_strategy[] = {