QT: Added xtt_clog destructor.

xtt/lib/xtt/qt/xtt_clog_qt.cqt

@@ -123,6 +123,11 @@ CLogQt::CLogQt(void* clog_parent_ctx, QWidget* clog_parent_wid,
   *status = 1;
 }
 
+CLogQt::~CLogQt()
+{
+  delete clognav;
+}
+
 void CLogQt::pop()
 {
   ::pop(toplevel);

xtt/lib/xtt/qt/xtt_clog_qt.h

@@ -50,6 +50,7 @@ class CLogQt : public CLog {
 public:
   CLogQt(void* clog_parent_ctx, QWidget* clog_parent_wid, const char* clog_name,
       pwr_tStatus* status);
+  ~CLogQt();
 
   QWidget* parent_wid;
   QWidget* clognav_widget;