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sf: Fix NULL pointer exception for flashes without lock methods
commit c3c016cf "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@gmail.com> Reviewed-by:
Fabio Estevam <fabio.estevam@freescale.com> Reviewed-by:
Jagan Teki <jteki@openedev.com>
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