2 o Avoid a double-mark-for-free warning when failing to attach a
3 transparent proxy connection. (We thought we had fixed this in
4 0.2.2.23-alpha, but it turns out our fix was checking the wrong
5 connection.) Fixes bug 2757; bugfix on 0.1.2.1-alpha (the original
6 bug) and 0.2.2.23-alpha (the incorrect fix).