log_setup() will open the console in systemd-executor because it's not pid 1 and it's not connected to the journal. So if the log target is later changed to kmsg, we have to reopen the log. But since log_open() won't open the same log twice, let's just call it unconditionally since it will be a noop if we try to reopen the same log. This makes sure that systemd-executor will log to the log target passed via --log-target= after parsing arguments.
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