CVE-2025-21677 pfcp: Destroy device along with udp socket's netns dismantle.

In the Linux kernel, the following vulnerability has been resolved: pfcp: Destroy device along with udp socket's netns dismantle. pfcpnewlink links the device to a list in devnetdev instead of net, where a udp tunnel socket is created. Even when net is removed, the device stays alive on devnetdev...