[U-Boot] cmd: spi: check return value of strdup

[Tom Rini]

On Sun, Mar 20, 2016 at 09:21:36PM +0800, Peng Fan wrote:

> Check return value of strdup.
> 
> Signed-off-by: Peng Fan <van.freenix at gmail.com>
> Cc: Przemyslaw Marczak <p.marczak at samsung.com>
> Cc: Bin Meng <bmeng.cn at gmail.com>
> Cc: Heiko Schocher <hs at denx.de>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Stefan Roese <sr at denx.de>
> Cc: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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