Code review comment for ~paelzer/ubuntu/+source/qemu:lp-1871830-fix-potential-off-by-one

# checklist for fixes
----------------------------

 [.] changelog entry correct, targeted to correct codename
 [.] update-maintainer has been run previously
 ----
 [-] changes forwarded upstream/debian (if appropriate)
 [.] patches match what was proposed upstream
 ----
 [.] patches correctly included in debian/patches/series?
 [.] patches have correct DEP3 metadata
 ----
 [-] verified dpkg-buildpackage -S and -b
 [.] autopkgtest against PPA or built package passes
 ----
 [-] testcase provided
 [-] was able to reproduce
 [-] fix solved provided testcase

----------------------------
 [.] = ok
 [x] = not ok
 [?] = question
 [!] = note
 [-] = n/a

+1 from me. PPA still building arm binaries.