Bluetooth: sco: fix information leak to userspace

struct sco_conninfo has one padding byte in the end.  Local variable
cinfo of type sco_conninfo is copied to userspace with this uninizialized
one byte, leading to old stack contents leak.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
static void __exit sco_exit(void)
{
	debugfs_remove(sco_debugfs);

	if (bt_sock_unregister(BTPROTO_SCO) < 0)
		BT_ERR("SCO socket unregistration failed");

	if (hci_unregister_proto(&sco_hci_proto) < 0)
		BT_ERR("SCO protocol unregistration failed");

	proto_unregister(&sco_proto);
}

static void __exit sco_exit(void)
{
	debugfs_remove(sco_debugfs);

	if (bt_sock_unregister(BTPROTO_SCO) < 0)
		BT_ERR("SCO socket unregistration failed");

	if (hci_unregister_proto(&sco_hci_proto) < 0)
		BT_ERR("SCO protocol unregistration failed");

	proto_unregister(&sco_proto);
}
