Comment 7 for bug 2033405

Tested on Debian unstable on ppc64el (with gcc 13.2.0-9) with -O3 and it is affected as well:

```
ssh platti.debian.org
$ session=$(schroot -c sid -b)
$ dd-schroot-cmd -c $session apt-get update
$ dd-schroot-cmd -c $session apt-get build-dep dcfldd
$ schroot -c $session -r
sid_ppc64el-dchroot$ apt source dcfldd
sid_ppc64el-dchroot$ cd dcfldd-1.9.1/
sid_ppc64el-dchroot$ vim debian/rules
# add: export DEB_CFLAGS_MAINT_APPEND=-O3
sid_ppc64el-dchroot$ dpkg-buildpackage -b
sid_ppc64el-dchroot$ ./src/dcfldd if=debian/tests/test.txt of=/tmp/test2.txt hash=md5,sha1,sha256,sha384,sha512

Total (md5): 92994b0ce292a217e3e3bc31b639e565

Total (sha1): bc0e4b74695142e0a0bdae87aea310d7078866cb

Total (sha256): b0041d27f7429be0d371dd1ff3eb5c7f4385f71e64757344631f84d15026ee5c

Total (sha384): 53b8374607a8258de4173265bfbfa6120093fd42090a92fd589cf2c6c16b4e421b5135777714976713f7949715720a83

Total (sha512): 969a39bf47b5f12d81121084f19cb5ae250e0c0ea5b7c6d82cf08131acde8e1955d137612c2f6b255e25b0e28f96f93586f90f06965cb8f719ed7fbdd95cc8d4

0+1 records in
0+1 records out
```