[U-Boot] tools/env: check that redundant environments have equal size

[Tom Rini]

On Thu, May 19, 2016 at 12:43:51PM +0200, Andreas Fenkart wrote:

> For double buffering to work, the target buffer must always be big
> enough to hold all data. This can only be ensured if buffers are of
> equal size, otherwise one must be smaller and we risk data loss
> when copying from the bigger to the smaller.
> 
> Signed-off-by: Andreas Fenkart <andreas.fenkart at digitalstrom.com>

Applied to u-boot/master, thanks!

-- 
Tom
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