Linters and simplify logic

Signed-off-by: Ryan Friedman <[email protected]>

src/CameraZoomPlugin.cc

@@ -165,23 +165,20 @@ void CameraZoomPlugin::Impl::OnZoom(const msgs::Double &_msg)
 void CameraZoomPlugin::Impl::InitialiseCamera()
 {
   // Wait for render engine to be available.
-  if (rendering::loadedEngines().empty()) {
+  if (rendering::loadedEngines().empty())
+  {
     return;
   }
 
   // Get scene.
   if (!this->scene)
   {
     this->scene = rendering::sceneFromFirstRenderEngine();
-    if (!this->scene) {
-      gzerr << "Failed to get scene in InitialiseCamera()!\n";
-      return;
-    }
-
   }
 
   // Return if scene not ready or no sensors available.
-  if (!this->scene->IsInitialized() ||
+  if (this->scene == nullptr ||
+      !this->scene->IsInitialized() ||
       this->scene->SensorCount() == 0)
   {
     gzwarn << "No scene or camera sensors available.\n";