char: xillybus: fix a refcount leak in cleanup_dev()
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 v5.17.15 by commit 21f1f167d727f3f857e26d509ef5a6d47fd31bc3. For more details please see the references link.