[media] gspca_zc3xx: Fix setting of jpeg quality while streaming

When the user changes the JPEG quality while the camera is streaming, the
driver should not only change the JPEG headers send to userspace, but also
actually tell the camera to use a different quantization table.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/zc3xx.c

@@ -5923,6 +5923,8 @@ static void setquality(struct gspca_dev *gspca_dev)
 	struct sd *sd = (struct sd *) gspca_dev;
 	s8 reg07;
 
+	jpeg_set_qual(sd->jpeg_hdr, jpeg_qual[sd->reg08]);
+
 	reg07 = 0;
 	switch (sd->sensor) {
 	case SENSOR_OV7620:
@@ -6886,7 +6888,6 @@ static int sd_start(struct gspca_dev *gspca_dev)
 		break;
 	}
 	setquality(gspca_dev);
-	jpeg_set_qual(sd->jpeg_hdr, jpeg_qual[sd->reg08]);
 	setlightfreq(gspca_dev);
 
 	switch (sd->sensor) {
@@ -7042,7 +7043,7 @@ static int sd_setquality(struct gspca_dev *gspca_dev, __s32 val)
 	sd->reg08 = i;
 	sd->ctrls[QUALITY].val = jpeg_qual[i];
 	if (gspca_dev->streaming)
-		jpeg_set_qual(sd->jpeg_hdr, sd->ctrls[QUALITY].val);
+		setquality(gspca_dev);
 	return gspca_dev->usb_err;
 }