OSV-2020-1880 Use-of-uninitialized-value in c_pdf14trans_clist_read_update

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21640 Crash type: Use-of-uninitialized-value Crash state: cpdf14transclistreadupdate applycreatecompositor executecompositorqueue...