[U-Boot] env: Avoid clobbering an edited variable on ctrl-c

[Tom Rini]

On Fri, Feb 08, 2013 at 10:12:34AM -0000, Joe Hershberger wrote:

> If readline says there was an error, don't write to the variable!
> 
> Signed-off-by: Joe Hershberger <joe.hershberger at ni.com>

Applied to u-boot/master, thanks!

-- 
Tom
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