USBDeviceJNI: restored logging as it was in master

Conflicts:
	libs/mavlink/include/mavlink/v1.0
	mavlink_generator
	src/GPS/Drivers

android/src/org/mavlink/qgroundcontrol/QGCActivity.java

@@ -205,7 +205,7 @@ public class QGCActivity extends QtActivity implements TextToSpeech.OnInitListen
 
         if (m_openedDevices == null)
         {
-            // Log.e(TAG, "m_openedDevices is null");
+            Log.e(TAG, "m_openedDevices is null");
             return null;
         }