From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH v7 06/15] bus: add helper to find which bus
	holds a device
Date: Fri, 30 Jun 2017 11:16:08 +0200
Message-ID: <2216663.aYTdufOMPG@xps>
References: <cover.1498577192.git.gaetan.rivet@6wind.com>
 <20170629182206.1072-1-jblunck@infradead.org>
 <20170629182206.1072-7-jblunck@infradead.org>
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Cc: dev@dpdk.org, gaetan.rivet@6wind.com, shreyansh.jain@nxp.com
To: Jan Blunck <jblunck@infradead.org>
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29/06/2017 20:21, Jan Blunck:
> +static int
> +bus_find_device(const struct rte_bus *bus, const void *_dev)
> +{
> +	struct rte_device *dev;
> +
> +	dev = bus->find_device(NULL, cmp_rte_device, _dev);
> +	return !dev;
> +}

The preferred code style is to make explicit the NULL comparisons:
	return dev == NULL;