The alsc component of ctt meant to average the two green channels into one, but used incorrect indexing resulting in only the first green channel being used. Fix this. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com>