[U-Boot] [U-Boot,2/2] bootm: make sure pass NULL when argc < 1

[Tom Rini]

On Fri, Aug 15, 2014 at 04:51:39PM -0700, Bryan Wu wrote:

> arg[0] might not be NULL even if argc < 1, so fix this as before.
> 
> Signed-off-by: Bryan Wu <pengw at nvidia.com>

Applied to u-boot/master, thanks!

-- 
Tom
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