Fix a few memory leaks

Some raw pointers never got released.

These errors were found by running QtCreator via Valgrind.

Change-Id: I9c5b2862b98597f3e468d573e7126d7d9ec46b05
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/coreplugin/designmode.cpp

@@ -189,6 +189,7 @@ void DesignMode::unregisterDesignWidget(QWidget *widget)
     foreach (DesignEditorInfo *info, d->m_editors) {
         if (info->widget == widget) {
             d->m_editors.removeAll(info);
+            delete info;
             break;
         }
     }

src/plugins/qmldesigner/components/componentcore/crumblebar.cpp

@@ -84,6 +84,11 @@ CrumbleBar::CrumbleBar(QObject *parent) :
     updateVisibility();
 }
 
+CrumbleBar::~CrumbleBar()
+{
+    delete m_crumblePath;
+}
+
 void CrumbleBar::pushFile(const QString &fileName)
 {
     if (m_isInternalCalled == false) {

src/plugins/qmldesigner/components/componentcore/crumblebar.h

@@ -42,6 +42,7 @@ class CrumbleBar : public QObject
     Q_OBJECT
 public:
     explicit CrumbleBar(QObject *parent = 0);
+    ~CrumbleBar();
 
     void pushFile(const QString &fileName);
     void pushInFileComponent(const ModelNode &modelNode);

src/plugins/qnx/qnxconfigurationmanager.cpp

@@ -71,6 +71,7 @@ QnxConfigurationManager::~QnxConfigurationManager()
 {
     m_instance = 0;
     qDeleteAll(m_configurations);
+    delete m_writer;
 }
 
 QList<QnxConfiguration *> QnxConfigurationManager::configurations() const