media: dvb: digitv: remove unused array element 0

The first element of the key array is not used. Remove it, and
along with it a uninitialized memory read.

This should fix the rc debug message.

Link: https://www.spinics.net/lists/kernel/msg3374861.htmlSuggested-by: Phong Tran <tranmanphong@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/dvb-usb/digitv.c

@@ -230,14 +230,15 @@ static struct rc_map_table rc_map_digitv_table[] = {
 
 static int digitv_rc_query(struct dvb_usb_device *d, u32 *event, int *state)
 {
+	struct rc_map_table *entry;
 	int ret, i;
-	u8 key[5];
+	u8 key[4];
 	u8 b[4] = { 0 };
 
 	*event = 0;
 	*state = REMOTE_NO_KEY_PRESSED;
 
-	ret = digitv_ctrl_msg(d, USB_READ_REMOTE, 0, NULL, 0, &key[1], 4);
+	ret = digitv_ctrl_msg(d, USB_READ_REMOTE, 0, NULL, 0, key, 4);
 	if (ret)
 		return ret;
 
@@ -248,20 +249,21 @@ static int digitv_rc_query(struct dvb_usb_device *d, u32 *event, int *state)
 		return ret;
 
 	/* if something is inside the buffer, simulate key press */
-	if (key[1] != 0)
-	{
-		  for (i = 0; i < d->props.rc.legacy.rc_map_size; i++) {
-			if (rc5_custom(&d->props.rc.legacy.rc_map_table[i]) == key[1] &&
-			    rc5_data(&d->props.rc.legacy.rc_map_table[i]) == key[2]) {
-				*event = d->props.rc.legacy.rc_map_table[i].keycode;
+	if (key[0] != 0) {
+		for (i = 0; i < d->props.rc.legacy.rc_map_size; i++) {
+			entry = &d->props.rc.legacy.rc_map_table[i];
+
+			if (rc5_custom(entry) == key[0] &&
+			    rc5_data(entry) == key[1]) {
+				*event = entry->keycode;
 				*state = REMOTE_KEY_PRESSED;
 				return 0;
 			}
 		}
+
+		deb_rc("key: %*ph\n", 4, key);
 	}
 
-	if (key[0] != 0)
-		deb_rc("key: %*ph\n", 5, key);
 	return 0;
 }