CVE-2024-42231 btrfs: zoned: fix calc_available_free_space() for zoned mode

In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix calcavailablefreespace for zoned mode calcavailablefreespace returns the total size of metadata or system block groups, which can be allocated from unallocated disk space. The logic is wrong on zoned mode in two...