[Bug 243179] fsck_msdosfs: Off-by-two in determination of FAT type

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243179

            Bug ID: 243179
           Summary: fsck_msdosfs: Off-by-two in determination of FAT type
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: delphij at FreeBSD.org

The FAT type determination in fsck_msdosfs is wrong.

In the code we used NumClusters as the upper (non-inclusive) boundary of valid
cluster number, so the actual value was 2 (CLUST_FIRST) more than the real
number of clusters.

Therefore, it's not right to use NumClusters as it is today to determine FAT
type.

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