Fix small logic error with NULL serial port.

src/comm/SerialLink.cc

@@ -463,12 +463,11 @@ bool SerialLink::hardwareConnect(QString &type)
     }
 
     m_port = new QSerialPort(m_portName);
-    m_port->moveToThread(this);
-
     if (!m_port) {
         emit communicationUpdate(getName(),"Error opening port: " + m_portName);
         return false; // couldn't create serial port.
     }
+    m_port->moveToThread(this);
 
     // We need to catch this signal and then emit disconnected. You can't connect
     // signal to signal otherwise disonnected will have the wrong QObject::Sender