Fix uninitialised memory write

Merged Michele Guerini Rocco requested to merge rnhmjoj/fonttosfnt:master into master

I found this while investigating non determinstic builds across different machines. It took me a while because I looked at the checksums before realizing the date fields (appearing much later in the font file) were different. Then I realized it was a date but strangely it wasn't changing with faketime and eventually I figured macTime(hi, lo) was returning -1, leaving hi and lo uninitialised.

Hope you'll find this fix appropriate, otherwise cosider this as a simple bug report.

Edited by Michele Guerini Rocco

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