OSV-2020-1877 Use-of-uninitialized-value in FAPI_FF_get_glyph

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23115 Crash type: Use-of-uninitialized-value Crash state: FAPIFFgetglyph getfapiglyphdata loadtruetypeglyph...