net/x25: Fix null-ptr-deref caused by x25_disconnect
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 v4.19.238 by commit 4c240c5a105557e4546d0836e694868f22fd09b0, it was introduced in version v4.19.137 by commit fca9ee21e9777c8e0c59660a6af8e4b10f93b968. For more details please see the references link.