ep_ memory is not garbage collected

[Jakub Zawadzki <darkjames-ws () darkjames pl>]

> From commit r42254 (reference counting of edt) 
we have problem with ep_ memory not being returned to pool after dissecting packet.
Wireshark after initial opening file, always keep edt for currently selected packet,
so edt_refs is always > 0.

You can reproduce it by loading some bigger files, and several times open expert
or conversation window.

After r43188 (not part of wireshark-1.8) affected is also filtering (if at least one packet
match filter), or selecting other packets.
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