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

[Heiko Schocher <hs@denx.de>]

Hello Tom,

Am 19.01.2019 um 03:54 schrieb 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@denx.de>
> 
> Applied to u-boot/master, thanks!

I am sorry, this patch was nonsense. After erasing the flash, and
saving a default Environment, the CONFIG_ENV_SIZE bytes are filled
with 0x00. So the memset with 0x00 should be OK. I have no idea
what gone wrong on my board :-(

I am not sure what gone wrong here, so, please can you revert this
patch?

bye,
Heiko
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