fix lua you all need this

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14767 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/languages/mod_lua/freeswitch_lua.h

@@ -32,7 +32,7 @@ class Session : public CoreSession {
 	virtual switch_status_t run_dtmf_callback(void *input, switch_input_type_t itype);
 	void unsetInputCallback(void);
 	void setInputCallback(char *cbfunc, char *funcargs = NULL);
-	void setHangupHook(char *func, char *arg);
+	void setHangupHook(char *func, char *arg = NULL);
 	bool ready();
 	int originate(CoreSession *a_leg_session, char *dest, int timeout);