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Check that userspace isn't passing in garbage in the colorkey
ioctl flags.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180206204333.4399-1-ville.syrjala@linux.intel.com

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>