[U-Boot] common: Fix cpu nr type which is always unsigned type

[Tom Rini]

On Wed, Jun 13, 2018 at 08:56:31AM +0200, Michal Simek wrote:

> cpu_cmd() is reading cpu number via simple_strtoul() which is always
> unsigned type.
> Platform code implementations are not expecting that nr can be negative
> and there is not checking in the code for that too.
> 
> This patch is using u32 type for cpu number to make sure that platform
> code get proper value range.
> 
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>

Applied to u-boot/master, thanks!

-- 
Tom
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