[U-Boot] env: sf: fix environment in SPI NOR

[Tom Rini]

On Fri, Jan 18, 2019 at 10:45:56AM +0100, Heiko Schocher wrote:

> commit 9a9d66f5eff0 ("env: add spi_flash_read_env function")
> 
> breaks Environment functionality, as it reads only
> until 2 \0 are found, but fills the buffer with 0x0
> instead 0xff which leads in an incorrect crc sum.
> 
> Fix: init the read buffer with 0xff instead 0x00
> 
> Signed-off-by: Heiko Schocher <hs at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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