if (fseeko(out, end_header_offset, SEEK_SET) != 0) {
ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" of WIM to "
"calculate integrity data", end_header_offset);
if (fseeko(out, end_header_offset, SEEK_SET) != 0) {
ERROR_WITH_ERRNO("Failed to seek to byte %"PRIu64" of WIM to "
"calculate integrity data", end_header_offset);