[media] gspca - topro: Lower the frame rate in 640x480 for the tp6800

The topro webcams don't support 30fps in 640x480 mode.
Signed-off-by: NJean-François Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/topro.c

@@ -3946,7 +3946,7 @@ static int get_fr_idx(struct gspca_dev *gspca_dev)
 		/* 640x480 * 30 fps does not work */
 		if (i == 6			/* if 30 fps */
 		 && gspca_dev->width == 640)
-			i = 0x86;		/* 15 fps */
+			i = 0x05;		/* 15 fps */
 	} else {
 		for (i = 0; i < ARRAY_SIZE(rates_6810) - 1; i++) {
 			if (sd->framerate >= rates_6810[i])