Cleanup some dynamic casts

From Coverity scan

eeschema/eeschema_config.cpp

@@ -395,6 +395,8 @@ void SCH_EDIT_FRAME::AddFormattingParameters( std::vector<PARAM_CFG*>& params )
 {
     EESCHEMA_SETTINGS* appSettings = dynamic_cast<EESCHEMA_SETTINGS*>( Kiface().KifaceSettings() );
 
+    wxCHECK( appSettings, /*void*/ );
+
     params.push_back( new PARAM_CFG_INT( wxT( "SubpartIdSeparator" ),
                                          LIB_PART::SubpartIdSeparatorPtr(), 0, 0, 126 ) );
     params.push_back( new PARAM_CFG_INT( wxT( "SubpartFirstId" ),

pcbnew/altium2kicadpcb_plugin/altium_pcb.cpp

@@ -1405,7 +1405,10 @@ void ALTIUM_PCB::ParseArcs6Data(
 
             if( elem.component != ALTIUM_COMPONENT_NONE )
             {
-                dynamic_cast<EDGE_MODULE*>( ds )->SetLocalCoord();
+                auto em = dynamic_cast<EDGE_MODULE*>( ds );
+
+                if( em )
+                    em->SetLocalCoord();
             }
         }
     }
@@ -1842,16 +1845,21 @@ void ALTIUM_PCB::ParseTexts6Data(
 
         itm->SetPosition( elem.position );
         tx->SetTextAngle( elem.rotation * 10. );
+
         if( elem.component != ALTIUM_COMPONENT_NONE )
         {
             TEXTE_MODULE* txm = dynamic_cast<TEXTE_MODULE*>( tx );
-            if( elem.isDesignator || elem.isComment )
+
+            if( txm )
             {
-                double orientation =
-                        static_cast<const MODULE*>( txm->GetParent() )->GetOrientation();
-                txm->SetTextAngle( orientation + txm->GetTextAngle() );
+                if( elem.isDesignator || elem.isComment )
+                {
+                    double orientation =
+                            static_cast<const MODULE*>( txm->GetParent() )->GetOrientation();
+                    txm->SetTextAngle( orientation + txm->GetTextAngle() );
+                }
+                txm->SetLocalCoord();
             }
-            txm->SetLocalCoord();
         }
 
         PCB_LAYER_ID klayer = GetKicadLayer( elem.layer );

pcbnew/footprint_viewer_frame.cpp

@@ -695,7 +695,7 @@ void FOOTPRINT_VIEWER_FRAME::AddFootprintToPCB( wxCommandEvent& aEvent )
 void FOOTPRINT_VIEWER_FRAME::LoadSettings( APP_SETTINGS_BASE* aCfg )
 {
     auto cfg = dynamic_cast<PCBNEW_SETTINGS*>( aCfg );
-    wxASSERT( cfg );
+    wxCHECK( cfg, /*void*/ );
 
     PCB_BASE_FRAME::LoadSettings( aCfg );