[U-Boot] part_efi: In is_gpt_valid() check argument validity before allocation

[Tom Rini]

On Tue, Oct 03, 2017 at 09:38:44AM -0400, Tom Rini wrote:

> While this goes somewhat against normal coding style we should ensure
> that dev_desc is not NULL before we dereference it in allocation of
> legacy_mbr.
> 
> Reported-by: Coverity (CID: 167292)
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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