[U-Boot] doc: Fix comparison operator

[Tom Rini]

On Sat, Oct 11, 2014 at 12:25:46AM +0200, Marek Vasut wrote:

> From: Olaf Mandel <o.mandel at menlosystems.com>
> 
> Align the documentation with the include/linux/etherdevice.h ,
> which is where this example comes from. The return value from
> the check was inverted in the documentation.
> 
> Signed-off-by: Olaf Mandel <o.mandel at menlosystems.com>
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Albert ARIBAUD <albert.u.boot at aribaud.net>
> Cc: Tom Rini <trini at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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