ipv4: Fix data-races around sysctlfibmultipathhashpolicy.
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 v5.15.58 by commit 21fb844bc1dc1461f5038d655aa1a14f39e13049, it was introduced in version v4.12 by commit bf4e0a3db97eb882368fd82980b3b1fa0b5b9778. For more details please see the references link.