GSD-2022-1004573 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 v5.10.132 by commit e088ceb73c24ab4774da391d54a6426f4bfaefce...