Bluetooth: constify seq_operations

bt_seq_ops is only used with __seq_open_private as
const struct seq_operations *
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/af_bluetooth.c

@@ -639,7 +639,7 @@ static int bt_seq_show(struct seq_file *seq, void *v)
 	return 0;
 }
 
-static struct seq_operations bt_seq_ops = {
+static const struct seq_operations bt_seq_ops = {
 	.start = bt_seq_start,
 	.next  = bt_seq_next,
 	.stop  = bt_seq_stop,