Use unique_ptr to avoid possible memory leak

components/resource/bulletshapemanager.cpp

@@ -83,7 +83,8 @@ public:
             return osg::ref_ptr<BulletShape>();
 
         osg::ref_ptr<BulletShape> shape (new BulletShape);
-        btBvhTriangleMeshShape* triangleMeshShape = new TriangleMeshShape(mTriangleMesh.release(), true);
+
+        auto triangleMeshShape = std::make_unique<TriangleMeshShape>(mTriangleMesh.release(), true);
         btVector3 aabbMin = triangleMeshShape->getLocalAabbMin();
         btVector3 aabbMax = triangleMeshShape->getLocalAabbMax();
         shape->mCollisionBox.mExtents[0] = (aabbMax[0] - aabbMin[0]) / 2.0f;
@@ -92,7 +93,7 @@ public:
         shape->mCollisionBox.mCenter = osg::Vec3f( (aabbMax[0] + aabbMin[0]) / 2.0f,
                                                   (aabbMax[1] + aabbMin[1]) / 2.0f,
                                                   (aabbMax[2] + aabbMin[2]) / 2.0f );
-        shape->mCollisionShape.reset(triangleMeshShape);
+        shape->mCollisionShape.reset(triangleMeshShape.release());
 
         return shape;
     }