Avoid compile warnings on really old wanpipe

git-svn-id: http://yate.null.ro/svn/yate/trunk@4580 acf43c95-373e-0410-b603-e72c3f656dc1

modules/server/wpcard.cpp

@@ -1726,12 +1726,10 @@ int WpSpan::readData()
 
 bool WpSpan::decodeEvent()
 {
+#ifdef WAN_EC_TONE_PRESENT
     api_rx_hdr_t* ev = (api_rx_hdr_t*)m_buffer;
-
     SignallingCircuitEvent* e = 0;
     WpCircuit* circuit = 0;
-
-#ifdef WAN_EC_TONE_PRESENT
     switch (ev->event_type) {
 	case WP_API_EVENT_NONE:
 	    return false;