Wireshark do not stop extcap on exit if no packets received yet

[Jirka Novak <j.novak () netsystem cz>]

Hi,

  I noticed issue #17781.
  I think that something like:

if (capture_in_progress)
  captureStop();

  should be used.
  I spend several hours with finding correct place where to fix it, but
with no success. I'm not able to track as signals are passed in the code
in this case (no data captured yet).
  Can I ask someone to advice me? I will finish patch then...

                                                Best regards,

                                                        Jirka
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