cleanup_dissection() called both on cf_close and cf_open()

[Anders Broman <a.broman () bredband net>]

Hi,
Looking into address resolution I found that the hosts file is read 
multiple times partly
because it's part of cleanup_dissection() which is called both on 
cf_open() and cf_close().

Should cleanup_dissection() take an argument showing whether its a file 
open or file close
operation and different measures taken at least when it comes to the 
host_name_lockup...?

Regards
Anders

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