STYLE: Consistency updates

src/functionObjects/graphics/runTimePostProcessing/scene.C

@@ -324,10 +324,10 @@ Foam::functionObjects::runTimePostPro::scene::scene
     name_(name),
     colours_(),
     mode_(mtStatic),
-    cameraPosition_(NULL),
-    cameraFocalPoint_(NULL),
-    cameraUp_(NULL),
-    cameraViewAngle_(NULL),
+    cameraPosition_(nullptr),
+    cameraFocalPoint_(nullptr),
+    cameraUp_(nullptr),
+    cameraViewAngle_(nullptr),
     clipBox_(),
     parallelProjection_(true),
     nFrameTotal_(1),