btrfs: do not BUGON in linktofixupdir
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 v5.12.9 by commit b545442133580dcb2f2496133bf850824d41255c, it was introduced in version by commit . For more details please see the references link.