[U-Boot] rsa: check that pointer checksum isn't NULL before using it

[Tom Rini]

On Tue, Mar 19, 2019 at 10:55:40AM +0100, Philippe Reynes wrote:

> The pointer checksum were used before checking that it
> isn't NULL. We move the code that use it after the check.
> 
> Reported-by: Coverity (CID: 185835)
> Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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