net-timestamp: convert sk->sktskey to atomict
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 v5.15.26 by commit ff999198ec2149a6b83edb083293c91ec027f56f, it was introduced in version v3.17 by commit 09c2d251b70723650ba47e83571ff49281320f7c. For more details please see the references link.