[Bug 270053] msdosfs: statfs tracks total file nodes, but not free file nodes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270053

            Bug ID: 270053
           Summary: msdosfs: statfs tracks total file nodes, but not free
                    file nodes
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: woodsb02@freebsd.org

The msdosfs_vfsops.c code is using the statfs(2) f_files limit variable to
represent the FAT root directory entities limit, but is not using the
corresponding f_ffree available variable to represent the current number of
root directory entities. This leads to the df(1) output incorrectly implying
that the number of root directory entities is at capacity.

To avoid this confusion, I think the msdosfs_vfsops.c should either set both
the f_files and f_ffree statfs variables so that df(1) correctly reports
%iused, or should set them both to zero so that df(1) shows %iused as "-".

Example output from FreeBSD 13.1-RELEASE on a FAT16 file system:

$ df -i /boot/efi
Filesystem  512-blocks Used  Avail Capacity iused ifree %iused  Mounted on
/dev/nvd0p1     532352 3680 528672     1%     512     0  100%   /boot/efi

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