s390/cio: fix out-of-bounds access on cio_ignore free
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 v5.15.78 by commit 0e501fd0f38e42304bfa0d46a812d93f80294a87, it was introduced in version v5.15 by commit 172da89ed0eaf9d9348f5decb86ad04c624b39d1. For more details please see the references link.