[HarfBuzz] potential divide-by-zero in GPOS sanitizer

[Jonathan Kew]

Hi Behdad,

It's possible for AnchorMatrix::sanitize() to fail with a div-by-zero error, if the 'rows' field is zero.
(See https://bugzilla.mozilla.org/show_bug.cgi?id=586501.)

Patch is attached.

JK

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