[U-Boot] Prevent a stack overflow in fit_check_sign

[Tom Rini]

On Tue, May 20, 2014 at 03:58:58PM +0200, Michael van der Westhuizen wrote:

> It is trivial to crash fit_check_sign by invoking with an
> absolute path in a deeply nested directory.  This is exposed
> by vboot_test.sh.
> 
> Signed-off-by: Michael van der Westhuizen <michael at smart-africa.com>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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