aio: fix use-after-free due to missing POLLFREE handling
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 v4.19.221 by commit 321fba81ec034f88aea4898993c1bf15605c023f, it was introduced in version v4.18 by commit 2c14fa838cbefc23cf1c73ca167ed85b274b2913. For more details please see the references link.