Remove unused variables

itte.lua

@@ -294,7 +294,6 @@ function itte.init_socket(name, svr)
     cap_checked = false,
     ns_checked = false,
     authed = false,
-    ping_time = 0,
   }
 
   -- Connect
@@ -837,7 +836,6 @@ function itte.listen(name, str)
 
   -- Respond to server ping
   if string.find(str, cxt.cmds.ping.check) == 1 then
-    cxt.state.ping_time = os.time()
     util.debug(itte.config.debugs.listen[1], str, itte.config.debug)
     itte.send_command(cxt.con, string.gsub(str, cxt.cmds.ping.check,
       cxt.cmds.ping.resp))
@@ -886,7 +884,6 @@ itte.docs.add_listener = [[  (context_table)
   ]]
 function itte.add_listener(cxt)
   local data, status = cxt.con:receive()
-  local delta = os.time() - cxt.state.ping_time
   if data ~= nil then
     itte.listen(cxt.name, data)