Jonas Jenwald 2b25deb84c Prevent errors in sanitizeTTProgram, during parsing of CALL functions, when encountering invalid functions stack deltas (bug 1473809) ...

*I was feeling bored; so this is a very quick, and somewhat naive, attempt at fixing the bug.*

The breaking error, i.e. `Error during font loading: invalid array length`, was thrown when attempting to re-size the `stack` to a *negative* length when parsing the CALL functions.

Fixes https://bugzilla.mozilla.org/show_bug.cgi?id=1473809.

2018-07-10 09:45:55 +02:00

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