Fix compiler warnings.

src/libs/qmljsdebugclient/qdeclarativedebugclient.cpp

@@ -87,7 +87,7 @@ public Q_SLOTS:
 };
 
 QDeclarativeDebugConnectionPrivate::QDeclarativeDebugConnectionPrivate(QDeclarativeDebugConnection *c)
-: QObject(c), q(c), protocol(0), gotHello(false), device(0)
+: QObject(c), q(c), protocol(0), device(0), gotHello(false)
 {
     protocol = new QPacketProtocol(q, this);
     QObject::connect(c, SIGNAL(connected()), this, SLOT(connected()));

src/plugins/coreplugin/externaltool.cpp

@@ -658,6 +658,7 @@ void ExternalToolRunner::error(QProcess::ProcessError error)
         FileManager::instance()->unexpectFileChange(m_expectedFileName);
     }
     // TODO inform about errors
+    Q_UNUSED(error);
     deleteLater();
 }
 

src/plugins/qmldesigner/designercore/model/rewriteactioncompressor.cpp

@@ -236,6 +236,7 @@ void RewriteActionCompressor::compressPropertyActions(QList<RewriteAction *> &ac
         if (RemovePropertyRewriteAction *removeAction = action->asRemovePropertyRewriteAction()) {
             const AbstractProperty property = removeAction->property();
             if (AddPropertyRewriteAction *addAction = addedProperties.value(property, 0)) {
+                Q_UNUSED(addAction);
             } else {
                 removedProperties.insert(property, action);
             }