btrfs: use latestdev in btrfsshow_devname
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 v5.15.11 by commit e342c2558016ead462f376b6c6c2ac5efc17f3b1. For more details please see the references link.