V4L/DVB: gspca - sn9c20x: Bad transfer size of Bayer images

As the end of frame marker does not contain any pixel, it must not be
transferred.
Reported-by: NIvo Jager <ivo.jager@siliconfields.net>
Signed-off-by: NJean-François Moine <moinejf@free.fr>
Cc: stable@kernel.org
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/sn9c20x.c

@@ -2357,8 +2357,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 			    (data[33] << 10);
 		avg_lum >>= 9;
 		atomic_set(&sd->avg_lum, avg_lum);
-		gspca_frame_add(gspca_dev, LAST_PACKET,
-				data, len);
+		gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
 		return;
 	}
 	if (gspca_dev->last_packet_type == LAST_PACKET) {