CVE-2026-23223 xfs: fix UAF in xchk_btree_check_block_owner

In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in xchkbtreecheckblockowner We cannot dereference bs-cur when trying to determine if bs-cur aliases bs-sc-sa.bno,rmapcur after the latter has been freed. Fix this by sampling before type before any freeing could...