[media] vivid-radio-rx: Don't go past buffer

drivers/media/platform/vivid/vivid-radio-rx.c:198 vivid_radio_rx_s_hw_freq_seek() error: buffer overflow 'vivid_radio_bands' 3 <= 3

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vivid/vivid-radio-rx.c

@@ -195,6 +195,8 @@ int vivid_radio_rx_s_hw_freq_seek(struct file *file, void *fh, const struct v4l2
 			if (dev->radio_rx_freq >= vivid_radio_bands[band].rangelow &&
 			    dev->radio_rx_freq <= vivid_radio_bands[band].rangehigh)
 				break;
+		if (band == TOT_BANDS)
+			return -EINVAL;
 		low = vivid_radio_bands[band].rangelow;
 		high = vivid_radio_bands[band].rangehigh;
 	}