[U-Boot] cmd: env: Fix CRC calculation for 'env export -c -s'

[Tom Rini]

On Wed, Sep 12, 2018 at 11:02:51AM +0000, Neil Stainton wrote:

> Fix failure to reimport exported checksummed, size constrained data block.
> 
> 'env export -c' command ignores optional -s size argument when calculating checksum causing subsequent 'env import -c' to fail.
> 
> Signed-off-by: Neil Stainton <nstainton at asl-control.co.uk>

Applied to u-boot/master, thanks!

-- 
Tom
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