[U-Boot] sf: Fix NULL pointer exception for flashes without lock methods

[Tom Rini]

On Fri, Nov 13, 2015 at 02:46:26AM -0800, Bin Meng wrote:

> commit c3c016c "sf: Add SPI NOR protection mechanism" introduced
> flash_lock()/flash_unlock()/flash_is_locked() methods for SPI flash,
> but not every flash driver supplies these. We should test these
> methods against NULL before actually calling them.
> 
> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Fabio Estevam <fabio.estevam at freescale.com>
> Reviewed-by: Jagan Teki <jteki at openedev.com>

Applied to u-boot/master, thanks!

-- 
Tom
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