xfs: small fixes for 5.12
Here's a handful of bug fixes for 5.12. The first one fixes a bug in
quota accounting on idmapped mounts; the second avoids a buffer deadlock
in bulkstat/inumbers if the inobt is corrupt; and the third fixes a
mount hang if mount fails after creating (or otherwise dirtying) the
quota inodes.
v2: remove unnecessary freeze protection from fsmap, refactor shared
parts of unmount code, tweaks to the itable deadlock detection