fix check

Signed-off-by: Ian Chen <[email protected]>

src/RenderEngineManager.cc

@@ -381,21 +381,18 @@ RenderEngine *RenderEngineManagerPrivate::Engine(EngineInfo _info,
     std::lock_guard<std::recursive_mutex> lock(this->enginesMutex);
     // Check to see if we need to load the engine
     auto engineIt = this->engines.find(libName);
-    bool loadEngine = engineIt == this->engines.end() ||
-                      !engineIt->second;
-
-    // Load the engine plugin
-    if (loadEngine && this->LoadEnginePlugin(libName, _path))
+    // Engine is already loaded
+    if (engineIt != this->engines.end() && engineIt->second)
+    {
+      engine = engineIt->second;
+    }
+    // Load the engine
+    else if (this->LoadEnginePlugin(libName, _path))
     {
       engineIt = this->engines.find(libName);
       if (engineIt != this->engines.end())
         engine = engineIt->second;
     }
-    else if (engineIt->second)
-    {
-      // Engine is already loaded
-      engine = engineIt->second;
-    }
   }
 
   if (!engine)