Make public headers compile with -Wzero-as-null-pointer-constant

... or equivalent.

QtBase 5.6 headers already compile that way, so let the other
modules follow suit.

Change-Id: I832c3e6f411280643004dc6dd9361b2ea63a6dca
Task-number: QTBUG-45291
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/src/macextras/qmactoolbar.h b/src/macextras/qmactoolbar.h
index 9f5b52a..a136686 100644
--- a/src/macextras/qmactoolbar.h
+++ b/src/macextras/qmactoolbar.h
@@ -53,8 +53,8 @@ class Q_MACEXTRAS_EXPORT QMacToolBar : public QObject
 {
     Q_OBJECT
 public:
-    explicit QMacToolBar(QObject *parent = 0);
-    QMacToolBar(const QString &identifier, QObject *parent = 0);
+    explicit QMacToolBar(QObject *parent = Q_NULLPTR);
+    QMacToolBar(const QString &identifier, QObject *parent = Q_NULLPTR);
     ~QMacToolBar();
 
     QMacToolBarItem *addItem(const QIcon &icon, const QString &text);
diff --git a/src/macextras/qmactoolbaritem.h b/src/macextras/qmactoolbaritem.h
index 6b73ced..c7bb2a1 100644
--- a/src/macextras/qmactoolbaritem.h
+++ b/src/macextras/qmactoolbaritem.h
@@ -62,7 +62,7 @@ public:
         FlexibleSpace
     };
 
-    QMacToolBarItem(QObject *parent = 0);
+    QMacToolBarItem(QObject *parent = Q_NULLPTR);
     virtual ~QMacToolBarItem();
 
     bool selectable() const;