OSV-2018-448 Use-of-uninitialized-value in CachedXFORM4to3

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5623 Crash type: Use-of-uninitialized-value Crash state: CachedXFORM4to3 cmsDoTransform fzlcmstransformpixmap...