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Date:   Mon, 29 Jun 2020 21:54:51 +0100
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Ding Xiang <dingxiang@cmss.chinamobile.com>
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        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] loop: fix passing zero to 'PTR_ERR' warning
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On Wed, Jun 24, 2020 at 04:48:42PM +0800, Ding Xiang wrote:
> Fix a static code checker warning:
>     drivers/block/loop.c:798 loop_attr_backing_file_show()
>     warn: passing zero to 'PTR_ERR'

Better fix the root cause of that the problem - bullshit checker,
that is...