[U-Boot] do_smhload: fix return code

[Tom Rini]

On Thu, Mar 02, 2017 at 05:45:16PM +0000, Ryan Harkin wrote:

> do_smhload was using a ulong to store the return value from
> smh_load_file. That returns an int, where -1 indicates an error. As a
> ulong will never be negative, smh_load_file errors were not detected and
> so_smhload always returned zero.
> 
> Also, when errors were spotted, do_smhload was returning 1, rather than
> the enumeration CMD_RET_FAILURE (which is also 1).
> 
> Signed-off-by: Ryan Harkin <ryan.harkin at linaro.org>
> Reviewed-by: Linus Walleij <linus.walleij at linaro.org>

Applied to u-boot/master, thanks!

-- 
Tom
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