CVE-2026-72354 ntfs: avoid stale runlist element dereference in MFT writeback

In the Linux kernel, the following vulnerability has been resolved: ntfs: avoid stale runlist element dereference in MFT writeback ntfswritemftblock maps each $MFT record through the $MFT data runlist. For sub-folio clusters it looks up a struct runlistelement under ni-runlist.lock, drops the loc...