[U-Boot] rsa: Fix two errors in the implementation

[Tom Rini]

On Wed, Jul 30, 2014 at 10:00:17AM -0600, Simon Glass wrote:

> 1. Failure to set the return code correctly
> 2. Failure to detect the loop end condition when the value is equal to
> the modulus.
> 
> Reported-by: Jeroen Hofstee <jeroen at myspectrum.nl>
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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