From mboxrd@z Thu Jan  1 00:00:00 1970
From: Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [PATCH gpio 4/4] drivers: gpio: use (!foo) instead of (foo == NULL)
Date: Wed, 8 Apr 2015 16:56:59 +0200
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On Wed, Apr 8, 2015 at 3:50 AM, Alexandre Courbot <gnurou@gmail.com> wrote:

> I wonder, is this any better, or is there a recommended guideline
> somewhere?

This construct is used in Chapter 7 of
Documentation/CodingStyle

Though the use is not commented on.

But it's fairly common & compact & nice I think.

Yours,
Linus Walleij