list: fix a data-race around ep->rdllist
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 v5.18.3 by commit e039c0b5985999b150594126225e1ee51df7b4c9, it was introduced in version v5.11 by commit e59d3c64cba69b57263dff1d62838bc6a819ae37. For more details please see the references link.