DeployConfiguration: fix memory leak

The ctor creates a m_stepList, which we need thus delete in fromMap.
Likely the m_stepList could simply be initialized with null in the
ctor.

Change-Id: I3fdb31b135b4b6ea528e0666117b63c2b39764cf
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/deployconfiguration.cpp

@@ -116,6 +116,7 @@ bool DeployConfiguration::fromMap(const QVariantMap &map)
         return false;
     QVariantMap data = map.value(QLatin1String(BUILD_STEP_LIST_PREFIX) + QLatin1String("0")).toMap();
     if (!data.isEmpty()) {
+        delete m_stepList;
         m_stepList = new BuildStepList(this, data);
         if (m_stepList->isNull()) {
             qWarning() << "Failed to restore deploy step list";