From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 09 Jan 2017 10:30:20 +0000
Subject: Re: [PATCH 4/8] [media] videobuf-dma-sg: Adjust 24 checks for null values
Message-Id: <20170109103020.GB4239@mwanda>
List-Id: <kernel-janitors.vger.kernel.org>
References: <9268b60d-08ba-c64e-1848-f84679d64f80@users.sourceforge.net>
 <7b963ec7-1ec7-5e44-e9ff-9385bc41aa48@users.sourceforge.net>
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To: SF Markus Elfring <elfring@users.sourceforge.net>
Cc: linux-media@vger.kernel.org, Dave Hansen <dave.hansen@linux.intel.com>, Jan Kara <jack@suse.cz>, Javier Martinez Canillas <javier@osg.samsung.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Lorenzo Stoakes <lstoakes@gmail.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Michal Hocko <mhocko@suse.com>, Sakari Ailus <sakari.ailus@linux.intel.com>, LKML <linux-kernel@vger.kernel.org>, kernel-janitors@vger.kernel.org

On Mon, Dec 26, 2016 at 09:48:19PM +0100, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 26 Dec 2016 20:30:19 +0100
> 
> Convert comparisons with the preprocessor symbol "NULL" or the value "0"
> to condition checks without it.

Generally lengths are numbers and not booleans so "len = 0" is ok.
Checkpatch doesn't complain about that.

regards,
dan carpenter