[PATCH] erofs: remove unnecessary output in erofs_show_options()

[Chao Yu]

On 2019/11/19 19:50, Chengguang Xu wrote:
> We have already handled cache_strategy option carefully,
> so incorrect setting could not pass option parsing.
> Meanwhile, print 'cache_strategy=(unknown)' can cause
> failure on remount.
> 
> Signed-off-by: Chengguang Xu <cgxu519 at mykernel.net>

Reviewed-by: Chao Yu <yuchao0 at huawei.com>

Thanks,