CVE-2022-50057 fs/ntfs3: Fix NULL deref in ntfs_update_mftmirr

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix NULL deref in ntfsupdatemftmirr If ntfsfillsuper wasn't called then sbi-sb will be equal to NULL. Code should check this ptr before dereferencing. Syzbot hit this issue via passing wrong mount param as can be seen...