cleanup Leapmotion initialization removes warning

about unused variable

interface/src/Application.cpp

@@ -1722,7 +1722,7 @@ void Application::init() {
     _faceplus.init();
     _visage.init();
 
-    Leapmotion* leap = Leapmotion::create();
+    Leapmotion::init();
 
     // fire off an immediate domain-server check in now that settings are loaded
     NodeList::getInstance()->sendDomainServerCheckIn();

interface/src/devices/Leapmotion.cpp

@@ -36,27 +36,26 @@ MotionTracker::Index evalJointIndex(bool isRightSide, int finger, int bone) {
     }
 }
 
-Leapmotion* Leapmotion::create() {
+// static
-    // check that the Leapmotion hasn't been created yet
+void Leapmotion::init() {
+    DeviceTracker* device = DeviceTracker::getDevice(NAME);
+
+    if (!device) {
+        // create a new Leapmotion and register it
+        Leapmotion* leap = new Leapmotion();
+        DeviceTracker::registerDevice(NAME, leap);
+    }
+}
+
+// static
+Leapmotion* Leapmotion::getInstance() {
     DeviceTracker* device = DeviceTracker::getDevice(NAME);
     if (!device) {
-        // create a new Leapmotion
+        // create a new Leapmotion and register it
-        Leapmotion* leap = new Leapmotion();
+        device = new Leapmotion();
-
+        DeviceTracker::registerDevice(NAME, device);
-        // register it
-        DeviceTracker::registerDevice(NAME, leap);
-
-        return leap;
-    }
-    else
-    {
-        Leapmotion* leap = dynamic_cast< Leapmotion* > (device);
-        if (leap) {
-            return leap;
-        }
-
-        return NULL;
     }
+    return dynamic_cast< Leapmotion* > (device);
 }
 
 Leapmotion::Leapmotion() :

interface/src/devices/Leapmotion.h

@@ -25,8 +25,10 @@ class Leapmotion : public MotionTracker {
 public:
     static const Name NAME;
 
+    static void init();
+
     /// Leapmotion MotionTracker factory
-    static Leapmotion* create();
+    static Leapmotion* getInstance();
 
     bool isActive() const { return _active; }