[U-Boot] tools: remove unused ret

[Tom Rini]

On Thu, Jan 18, 2018 at 08:19:43PM +0100, Jelle van der Waa wrote:

> Remove unused ret from fw_env_flush.
> 
> Signed-off-by: Jelle van der Waa <jelle at vdwaa.nl>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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