OSV-2018-413 Use-of-uninitialized-value in fz_adjust_ft_glyph_width

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5596 Crash type: Use-of-uninitialized-value Crash state: fzadjustftglyphwidth doftrenderglyph fzrenderftglyph...