[media] gspca - sn9c20x: Don't do sensor update before the capture is started

Telling the bridge to update the sensor when setting the exposure or the gain
is not needed when the image transfer is not started.
Signed-off-by: NJean-François Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/sn9c20x.c

@@ -1644,9 +1644,12 @@ static void set_exposure(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 exp[8] = {sd->i2c_intf, sd->i2c_addr,
-				0x00, 0x00, 0x00, 0x00, 0x00, 0x1e};
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x10};
 	int expo;
 
+	if (gspca_dev->streaming)
+		exp[7] = 0x1e;
+
 	expo = sd->ctrls[EXPOSURE].val;
 	switch (sd->sensor) {
 	case SENSOR_OV7660:
@@ -1683,9 +1686,12 @@ static void set_gain(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 gain[8] = {sd->i2c_intf, sd->i2c_addr,
-				0x00, 0x00, 0x00, 0x00, 0x00, 0x1d};
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x10};
 	int g;
 
+	if (gspca_dev->streaming)
+		gain[7] = 0x15;		/* or 1d ? */
+
 	g = sd->ctrls[GAIN].val;
 	switch (sd->sensor) {
 	case SENSOR_OV7660: