Add explicit and 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.

Cleaned up placement of * and & in parameters as a drive-by.

Added explicit where it was missing as a drive-by. This is
not a source-incompatible change, because code that breaks
by this is a bug. Let's not have this sitting around in an LTS.

Task-number: QTBUG-45291
Change-Id: If81ed0c71393aee21d347f5ade4bf3fcc07cd82f
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/multimedia/audio/qaudioinput.h b/src/multimedia/audio/qaudioinput.h
index bb809251c..6effa788f 100644
--- a/src/multimedia/audio/qaudioinput.h
+++ b/src/multimedia/audio/qaudioinput.h
@@ -56,8 +56,8 @@ class Q_MULTIMEDIA_EXPORT QAudioInput : public QObject
     Q_OBJECT
 
 public:
-    explicit QAudioInput(const QAudioFormat &format = QAudioFormat(), QObject *parent = 0);
-    explicit QAudioInput(const QAudioDeviceInfo &audioDeviceInfo, const QAudioFormat &format = QAudioFormat(), QObject *parent = 0);
+    explicit QAudioInput(const QAudioFormat &format = QAudioFormat(), QObject *parent = Q_NULLPTR);
+    explicit QAudioInput(const QAudioDeviceInfo &audioDeviceInfo, const QAudioFormat &format = QAudioFormat(), QObject *parent = Q_NULLPTR);
     ~QAudioInput();
 
     QAudioFormat format() const;