[U-Boot] Avoid using gawk-specific strtonum()

[Tom Rini]

On Wed, Jun 18, 2014 at 12:10:15AM -0600, Simon Glass wrote:

> We need to subtract two hex numbers. Avoid using strtonum() by doing the
> subtraction in bc with a suitable input base.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Reported-by: Vasili Galka <vvv444 at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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