btrfs: replace BTRFSMAXEXTENTSIZE with fsinfo->maxextentsize
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 v5.15.64 by commit 1aa262c1d056551dd1246115af8b7e351184deae, it was introduced in version v5.12 by commit d8e3fb106f393858b90b3befc4f6092a76c86d1c. For more details please see the references link.