OSV-2021-1081 Heap-use-after-free in gx_pattern_accum_finalize_cw

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36714 Crash type: Heap-use-after-free READ 8 Crash state: gxpatternaccumfinalizecw gxdevicefinalize gcobjectssetreloc...