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Either of protect and protect_check driver callbacks can be NULL. In virtual_protect, reuse flash_driver_protect which checks for that case and generates a nice error message and return code. In virtual_protect_check, there is no corresponding flash_driver_* function, so add the NULL check directly. Change-Id: Ia63d85ede640a8382cf5cad0760f5d1ffe4d7cfe Signed-off-by: Christopher Head <chead@zaber.com> Reviewed-on: http://openocd.zylin.com/5782 Tested-by: jenkins Reviewed-by: Tomas Vanek <vanekt@fbl.cz>