net: Fix a data-race around sysctlnetbusy_poll.
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 4e12829fd3b9fd428424e865fbb90c093080cb4d, it was introduced in version v3.11 by commit 060212928670593fb89243640bf05cf89560b023. For more details please see the references link.