Simplify libarchive's fuzzer (#8781)
Simplify libarchive's fuzzer (#8781)

Co-authored-by: Julien Voisin <85d099d025d9e75aa56e67c2f64641cdd4f9d106@google.com>
google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz,google/oss-fuzz