[U-Boot] [U-Boot,1/1] env: correct sign for error code

[Tom Rini]

On Mon, May 08, 2017 at 07:30:58PM +0200, xypron.glpk at gmx.de wrote:

> Error codes should be negative.
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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