net: fix potential refcount leak in ndiscrouterdiscovery()
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 v5.15.63 by commit ffb15594433391fd7885eb88ce5a7f7bdeefbb15, it was introduced in version v5.12 by commit 6b2e04bc240fe9be9e690059f710e9f95346d34d. For more details please see the references link.