- call `check_and_close_fd_13()` directly when `exit_with_error()` called, don't wait for trap
- store PID spawned by `do_with_logging()` under `$global_tee_pid`
- `check_and_close_fd_13()`:
- sprinkle with `sync` to give a chance for stuff to die gracefully
- check if `$global_tee_pid` is set and actually a running PID, if so, kill it
- do not blindly "wait" for stuff, instead, kill it and wait for it to die -- 100% more likely to not hang ;-)
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