[media] gscpa_stv06xx: Make sd_desc const

Now that stv06xx is using the control framework it is no longer necessary
to have a (non const) copy of sd_desc inside the sd specific data struct.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/stv06xx/stv06xx.c

@@ -542,9 +542,8 @@ static int stv06xx_config(struct gspca_dev *gspca_dev,
 
 	PDEBUG(D_PROBE, "Configuring camera");
 
-	sd->desc = sd_desc;
 	sd->bridge = id->driver_info;
-	gspca_dev->sd_desc = &sd->desc;
+	gspca_dev->sd_desc = &sd_desc;
 
 	if (dump_bridge)
 		stv06xx_dump_bridge(sd);

drivers/media/video/gspca/stv06xx/stv06xx.h

@@ -92,9 +92,6 @@ struct sd {
 	/* Control handler */
 	struct v4l2_ctrl_handler ctrl_handler;
 
-	/* A pointer to the sd_desc struct */
-	struct sd_desc desc;
-
 	/* Sensor private data */
 	void *sensor_priv;