OSV-2022-803 Segv on unknown address in gs_fapi_ft_get_scaled_font

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=50720 Crash type: Segv on unknown address Crash state: gsfapiftgetscaledfont gsfapipreparefont gsfapipassfont...