[Bug 240619] makefs: "ffs_alloccg: map corrupted" error on small filesystem

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240619

            Bug ID: 240619
           Summary: makefs: "ffs_alloccg: map corrupted" error on small
                    filesystem
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

While investigating PR196390 I encountered an error during the creation of a
small filesystem:

% (cd /; makefs ~/image ~/metalog)
Calculated size of `/home/emaste/image': 131072 bytes, 8 inodes
Extent size set to 32768
/home/emaste/image: 0.1MB (256 sectors) block size 32768, fragment size 4096
        using 1 cylinder groups of 0.12MB, 4 blks, 256 inodes.
super-block backups (for fsck -b #) at:
 64,
Populating `/home/emaste/image'
makefs: ffs_alloccg: map corrupted: start 1 len 3 offset 206 206

metalog contained the example from PR196390,
. type=dir uname=root gname=wheel mode=0755
./etc type=dir uname=root gname=wheel mode=0755
./sbin type=dir uname=root gname=wheel mode=0755
./usr type=dir uname=root gname=wheel mode=0755
./usr/bin type=dir uname=root gname=wheel mode=0755
./usr/bin/passwd type=file uname=root gname=wheel mode=04555 size=7000
./etc/passwd type=file mode=0644 uname=root gname=wheel

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