Fix a few minor Coverity warnings

3d-viewer/3d_cache/dialogs/panel_prev_3d.cpp

@@ -120,7 +120,7 @@ PANEL_PREV_3D::PANEL_PREV_3D( wxWindow* aParent, PCB_BASE_FRAME* aFrame, MODULE*
     m_SizerPanelView->Add( m_previewPane, 1, wxEXPAND, 5 );
 
     // Tell the canvas about the infobar
-    if( m_previewPane && m_infobar )
+    if( m_infobar )
         m_previewPane->SetInfoBar( m_infobar );
 
     for( wxEventType eventType : { wxEVT_MENU_OPEN, wxEVT_MENU_CLOSE, wxEVT_MENU_HIGHLIGHT } )

include/tool/edit_points.h

@@ -55,7 +55,8 @@ public:
         m_position( aPoint ),
         m_connection( aConnection ),
         m_isActive( false ),
-        m_isHover( false )
+        m_isHover( false ),
+        m_gridFree( false )
     {
     }
 

pcbnew/drc/drc_test_provider_silk_clearance.cpp

@@ -45,7 +45,9 @@
 class DRC_TEST_PROVIDER_SILK_CLEARANCE : public DRC_TEST_PROVIDER
 {
 public:
-    DRC_TEST_PROVIDER_SILK_CLEARANCE ()
+    DRC_TEST_PROVIDER_SILK_CLEARANCE ():
+        m_board( nullptr ),
+        m_largestClearance( 0 )
     {
     }