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

[Gao Xiang]

On Tue, Nov 19, 2019 at 07:50:49PM +0800, 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: Gao Xiang <gaoxiang25 at huawei.com>

Thanks,
Gao Xiang