[Freeciv-Dev] (PR#8500) packet_single_want_hack_req isn't freed

["jdorje@xxxxxxxxxxxx" <jdorje@xxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8500 >

In the following code in srv_main.c:

   if (type == PACKET_SINGLE_WANT_HACK_REQ) {
     handle_single_want_hack_req(pconn,
                ((struct packet_single_want_hack_req *)packet)->challenge);
     return TRUE;
   }

packet should be freed before the return statement (this is done for all 
other packets).

However this isn't clean because the caller gives us packet directly. 
It should be the caller who frees it.

jason