l2tp: prevent lockdep issue in l2tptunnelregister()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v6.1.9 by commit b717cf5a6bd8966c1fb1f89cb80bb6f9436e3f5d, it was introduced in version v6.1.9 by commit cef0845b6dcfa2f6c2c832e7f9622551456c741d. For more details please see the references link.