undo changes to zip source
zip_source_rollback_write() reverts changes
written to source, restoring the data before
zip_source_begin_write(3) was called. Usually this removes
temporary files or frees buffers.
Upon successful completion 0 is returned. Otherwise, -1 is returned and the
error information in source is set to indicate the
zip_source_rollback_write() was added in libzip 1.0.