[U-Boot] [U-Boot,1/4] env_sf: factor out prepare_flash_device

[Tom Rini]

On Mon, Nov 28, 2016 at 11:01:14AM +0100, Andreas Fenkart wrote:

> copy&paste code found in single/double buffered code path
> 
> Signed-off-by: Andreas Fenkart <andreas.fenkart at digitalstrom.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Please test build this series on all platforms (perhaps via travis-ci)
as this breaks on ls1012afrdm_qspi and others, thanks!

-- 
Tom
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