[U-Boot] Initialize SHA buffer size var in passwd_abort

[Tom Rini]

On Fri, Jan 12, 2018 at 09:04:38AM +0100, Martin Etnestad wrote:

> The call to hash_block in passwd_abort fails with error ENOSPC on some
> systems. The reason is that the variable which specifies the size of the
> buffer to contain the computed hash does not get initialized.
> 
> This patch initializes the variable with the size of the buffer.
> 
> Signed-off-by: Martin Etnestad <martin.etnestad at appeartv.com>

Applied to u-boot/master, thanks!

-- 
Tom
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