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It should not matter in these cases, but let's follow shell scripting
best practices.

So we don't keep on accumulating duplicates of the same firewall rule
if we restart multiple times during the same session. Idempotence for
the win!

I think it is possible that Tor could be fast enough to create the
hidden hidden-related before we start `inotify-wait` and end up
waiting forever.

Closes: #11224