Refactored libgptf_fuzzer am: 972a538f1e am: cbf647e1cf

Original change: https://android-review.googlesource.com/c/platform/external/gptfdisk/+/3019119

Change-Id: Ib59fcc5b0d73470626d96c86bb5886442261bb0b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>