igmp: Fix data-races around sysctligmpqrv.
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 v5.18.15 by commit c2954671010cd1127d1ffa328c6e6f8e99930982, it was introduced in version v3.18 by commit a9fe8e29945d56f35235a3a0fba99b4cf181d211. For more details please see the references link.