Do not close closed device in Terminal example

When opening is fails, the QSP himself close a device. Thus, we do not
need to close device in Terminal example again, because it caused
emmiting of the QSP::NotOpenError and to showing of additional
messagebox.

Change-Id: Id8aa3f3b835fd7d4187bdf83c1d6584d5fd541f7
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/examples/serialport/terminal/mainwindow.cpp b/examples/serialport/terminal/mainwindow.cpp
index f9967cc..2cb52a1 100644
--- a/examples/serialport/terminal/mainwindow.cpp
+++ b/examples/serialport/terminal/mainwindow.cpp
@@ -109,7 +109,8 @@ void MainWindow::openSerialPort()
 //! [5]
 void MainWindow::closeSerialPort()
 {
-    serial->close();
+    if (serial->isOpen())
+        serial->close();
     console->setEnabled(false);
     ui->actionConnect->setEnabled(true);
     ui->actionDisconnect->setEnabled(false);