[Bug 229929] makefs(8) can underestimate image size

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229929

            Bug ID: 229929
           Summary: makefs(8) can underestimate image size
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

With no -M, -m, or -s options, makefs should autocalculate the image size. 
However, sometimes it underestimates the size required, then fails when it's
writing the image with an error like this:

Calculated size of `/tmp/kyua.ZQYFDj/2/work/test.img': 688128 bytes, 33 inodes
Extent size set to 32768
/tmp/kyua.ZQYFDj/2/work/test.img: 0.7MB (1344 sectors) block size 32768,
fragment size 4096
        using 1 cylinder groups of 0.66MB, 21 blks, 256 inodes.
super-block backups (for fsck -b #) at:
 64,
Populating `/tmp/kyua.ZQYFDj/2/work/test.img'
makefs: Writing inode 22 (524288.file), bytes 491520 + 32768: No space left on
device

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