Followup to changeset efed7493f2c1: Forgot to forward the start event to the MAC layer.

src/devices/wifi/wifi-net-device.cc

@@ -91,6 +91,15 @@ WifiNetDevice::DoDispose (void)
   NetDevice::DoDispose ();
 }
 
+void
+WifiNetDevice::DoStart (void)
+{
+  m_phy->Start ();
+  m_mac->Start ();
+  m_stationManager->Start ();
+  NetDevice::DoStart ();
+}
+
 void
 WifiNetDevice::CompleteConfig (void)
 {

src/devices/wifi/wifi-net-device.h

@@ -104,6 +104,7 @@ public:
 
 private:
   virtual void DoDispose (void);
+  virtual void DoStart (void);
   void ForwardUp (Ptr<Packet> packet, Mac48Address from, Mac48Address to);
   void LinkUp (void);
   void LinkDown (void);