[PR] read OldFfn font description length as unsigned byte [p oi]

metsw24-max opened a new pull request, #1122:
URL: https://github.com/apache/poi/pull/1122

   **Signed font-description length in OldFfn**
   
   The length byte for a Word 6/95 font record is read as a signed `byte`, so a description of 128 bytes or more turns negative and slips past the table-end guard. A record that large then loses its alternate font name and reports the wrong record length, so the remaining font table is parsed from the wrong offset. The newer `Ffn` reader already takes the equivalent `cbFfnM1` field through `getUByte`, so this keeps `OldFfn` consistent with it.


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