Cleanup QtWidgets examples

Cleanup QtWidgets examples:
 - use nullptr (clang-tidy)
 - use member-initialization
 - adjust the style
 - fix includes

Change-Id: Ic5448606aacc525ea60b615a69227017aa2b821a
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/widgets/tutorials/modelview/3_changingmodel/main.cpp b/examples/widgets/tutorials/modelview/3_changingmodel/main.cpp
index 2330019f93..90a8c6e894 100644
--- a/examples/widgets/tutorials/modelview/3_changingmodel/main.cpp
+++ b/examples/widgets/tutorials/modelview/3_changingmodel/main.cpp
@@ -56,7 +56,7 @@ int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     QTableView tableView;
-    MyModel myModel(0);
+    MyModel myModel;
     tableView.setModel(&myModel);
     tableView.show();
     return a.exec();