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 v5.15.33 by commit 409570a619c1cda2e0fde6018a256b9e3d3ba0ee, it was introduced in version v5.7 by commit 4becb7ee5b3d2829ed7b9261a245a77d5b7de902. For more details please see the references link.