QmlProfiler: Don't print assert when trying to connect a second time

This can happen when e.g. the first attempt failed because of an
unavailable port.

Change-Id: I7e61c6f6d0a65c48c1b7031be95bdabd965fe5ab
Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>

src/plugins/qmlprofiler/qmlprofilertool.cpp

@@ -533,7 +533,8 @@ QWidget *QmlProfilerTool::createWidgets()
 
 void QmlProfilerTool::connectClient(int port)
 {
-    QTC_ASSERT(!d->m_client, return;)
+    if (d->m_client)
+        delete d->m_client;
     d->m_client = new QDeclarativeDebugConnection;
     d->m_traceWindow->reset(d->m_client);
     connect(d->m_client, SIGNAL(stateChanged(QAbstractSocket::SocketState)),