Fix crash on exit.

If we do not delete ApplyProgressDialog, then it later emits
finished which in turn attempts to scanDevices even though kpmcore helper
is already stopped and QCA private key is deleted.

src/gui/applyprogressdialog.h

@@ -16,8 +16,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
  *************************************************************************/
 
-#if !defined(APPLYPROGRESSDIALOG_H)
-
+#ifndef APPLYPROGRESSDIALOG_H
 #define APPLYPROGRESSDIALOG_H
 
 #include <QDialog>

src/gui/mainwindow.cpp

@@ -166,6 +166,7 @@ void MainWindow::closeEvent(QCloseEvent* event)
 
     KXmlGuiWindow::closeEvent(event);
     ExternalCommand::stopHelper();
+    delete m_ApplyProgressDialog;
 }
 
 void MainWindow::changeEvent(QEvent* event)