selftests/xsk: Avoid use-after-free on ctx
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 v5.10.150 by commit 557600830515199bc4ec31ca53e17791e4100d91, it was introduced in version v5.10.137 by commit e2d2dcab19f6ade212aecbed0d8d50144fc1a6f1. For more details please see the references link.