GSD-2022-1006689 ip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed

ip6mr: fix UAF issue in ip6mrskdone when addrconfinitnet failed 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 v6.0.6 by commit...