Fix a few Coverity warnings (not initialized vars)

It also fixes a potential crash when closing Kicad.

eeschema/navlib/nl_schematic_plugin.cpp

@@ -28,6 +28,8 @@ NL_SCHEMATIC_PLUGIN::NL_SCHEMATIC_PLUGIN()
 {
     if( ADVANCED_CFG::GetCfg().m_Use3DConnexionDriver )
         m_impl = new NL_SCHEMATIC_PLUGIN_IMPL();
+    else
+        m_impl = nullptr;
 }
 
 

eeschema/navlib/nl_schematic_plugin_impl.cpp

@@ -53,7 +53,10 @@ const wxChar* NL_SCHEMATIC_PLUGIN_IMPL::m_logTrace = wxT( "KI_TRACE_NL_SCHEMATIC
 
 
 NL_SCHEMATIC_PLUGIN_IMPL::NL_SCHEMATIC_PLUGIN_IMPL() :
-        CNavigation3D( false, false ), m_viewport2D( nullptr ), m_isMoving( false )
+        CNavigation3D( false, false ),
+        m_viewport2D( nullptr ),
+        m_isMoving( false ),
+        m_viewportWidth( 0.0 )
 {
     PutProfileHint( "KiCAD Eeschema" );
 }

eeschema/sch_plugins/ltspice/ltspice_schematic.h

@@ -41,7 +41,11 @@ struct LTSPICE_FILE
 
     LTSPICE_FILE( const wxFileName& aFilename, const VECTOR2I& aOffset ) :
             Name( aFilename ),
-            Offset( aOffset )
+            Offset( aOffset ),
+            ParentIndex( 0 ),
+            Sheet( nullptr ),
+            Screen( nullptr )
+
     { }
 
     bool operator<( const LTSPICE_FILE& t ) const

pcbnew/navlib/nl_pcbnew_plugin.cpp

@@ -27,6 +27,8 @@ NL_PCBNEW_PLUGIN::NL_PCBNEW_PLUGIN( PCB_DRAW_PANEL_GAL* aViewport )
 {
     if( ADVANCED_CFG::GetCfg().m_Use3DConnexionDriver )
         m_impl = new NL_PCBNEW_PLUGIN_IMPL( aViewport );
+    else
+        m_impl = nullptr;
 }