net, neigh: Fix null-ptr-deref in neightableclear()
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 v6.0.8 by commit a99a8ec4c62180c889482a2ff6465033e0743458, it was introduced in version v6.0 by commit 66ba215cb51323e4e55e38fd5f250e0fae0cbc94. For more details please see the references link.