Code review comment for lp:~andreas-pokorny/mir/fix-1580774

If the logic should just be to check for 'used' IMO, we may as well change it for 0.22/0.23.
If its prohibitively difficult to test the change for the fix (maybe its on a device we dont have?), then I'd be onboard with landing the existing code. So I guess my question is: Is it prohibitively tricky to quickly test the fix to unblock OTA11? If yes, then approve, else needs-fixing