net: Fix data-races around sysctlmaxskb_frags.
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 v5.15.64 by commit 70564ad8d1904cccba13f002cb07730b3aac25dd, it was introduced in version v4.5 by commit 5f74f82ea34c0da80ea0b49192bb5ea06e063593. For more details please see the references link.