Initialize some variables

src/celengine/render.cpp

@@ -6471,7 +6471,7 @@ class PointStarRenderer : public ObjectRenderer<Star, float>
     float cosFOV{ 1.0f };
 
     const ColorTemperatureTable* colorTemp{ nullptr };
-    float SolarSystemMaxDistance;
+    float SolarSystemMaxDistance { 1.0f };
 #ifdef DEBUG_HDR_ADAPT
     float minMag;
     float maxMag;

src/celestia/qt/qtappwin.cpp

@@ -141,7 +141,7 @@ class FPSActionGroup
     QActionGroup *m_actionGroup;
     std::map<int, QAction*> m_actions;
     QAction *m_customAction;
-    int m_lastFPS;
+    int m_lastFPS { 0 };
 public:
     FPSActionGroup(QObject *p = nullptr);