LCL: Avoid SegFault of freshly created TCustomListview with owner-data (issue #34407, patch by Charles Grunwald).

git-svn-id: trunk@59287 -

lcl/include/customlistview.inc

@@ -1670,6 +1670,7 @@ begin
         EndUpdate;
       end;
     end else
+    if FSelected <> nil then
       FSelected.Selected := False;
     FSelected := nil;
     Include(FFlags,lffSelectedValid);