patch for HTEvtLst.c

I think there is a bug in HTEventList_unregister.
The clean up is not complete.
 
I have attached to this mail a diff file of a patch I am using.
 
--
Serge Adda
Server Development Manager
InfoVista S.A.                  http://www.infovista.com
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6, rue de la Terre de Feu 
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