GSD-2022-1004701 icmp: Fix data-races around sysctl.

icmp: Fix data-races around sysctl. 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 v5.4.207 by commit 0cba7ca667ceb06934746ddd9833a25847bde81d,...