[Bug 127270] fsck_msdosfs(8) may crash if BytesPerSec is zero

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=127270

NGie Cooper <ngie at FreeBSD.org> changed:

           What    |Removed                     |Added
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           Assignee|freebsd-fs at FreeBSD.org      |ngie at FreeBSD.org
                 CC|                            |ngie at FreeBSD.org

--- Comment #2 from NGie Cooper <ngie at FreeBSD.org> ---
This should avoid the divide by 0, but I'd need to verify that the behavior is
correct: 
https://people.freebsd.org/~ngie/bug127270.patch

This situation should occur if and when boot blocks 12 and 13 are 0, but there
might need to be some additional conditions that need to be tripped in order
for the divide by 0 to occur:

 66         boot->bpbBytesPerSec = block[11] + (block[12] << 8);

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