thermostat: fix invalid free on exit

soft/thermostat/inc/mainwindow.h

@@ -33,7 +33,7 @@ public:
 
 private:
 	MQTTClient *m_mqtt;
-	QPushButton m_state_btn;
+	QPushButton *m_state_btn;
 	QVector<ZoneItem *> m_zones;
 	QTimer *m_timer;
 	BoostDlg *m_boost;

soft/thermostat/src/mainwindow.cpp

@@ -49,7 +49,7 @@ MainWindow::MainWindow(QWidget *parent) :
 	 */
 	QGridLayout *mainLayout = new QGridLayout;
 
-	m_state_btn.setText(tr("Auto"));
+	m_state_btn = new QPushButton("Auto");
 	QPushButton *menu_btn = new QPushButton(tr("Menu"));
 
 	if (s->nbZones() < MAX_NB_ZONES) {
@@ -61,7 +61,7 @@ MainWindow::MainWindow(QWidget *parent) :
 		mainLayout->addWidget(menu_btn, 0, 2);
 		mainLayout->addWidget(m_zones.at(2), 1, 0);
 		mainLayout->addWidget(m_zones.at(3), 1, 1);
-		mainLayout->addWidget(&m_state_btn, 1, 2);
+		mainLayout->addWidget(m_state_btn, 1, 2);
 	}
 	update_state_btn(s->m_state);
 
@@ -73,10 +73,10 @@ MainWindow::MainWindow(QWidget *parent) :
 	font.setPointSize(12);
 	font.setBold(true);
 	menu_btn->setFont(font);
-	m_state_btn.setFont(font);
+	m_state_btn->setFont(font);
 
 	menu_btn->setSizePolicy(*szPolicy);
-	m_state_btn.setSizePolicy(*szPolicy);
+	m_state_btn->setSizePolicy(*szPolicy);
 
 	QWidget *mainWidget = new QWidget;
 	mainWidget->setLayout(mainLayout);
@@ -107,7 +107,7 @@ MainWindow::MainWindow(QWidget *parent) :
 	connect(this, SIGNAL(setAllHeatersOn(bool)), m_mqtt, SLOT(allHeatersOn(bool)));
 	connect(m_mqtt, SIGNAL(connected(void)), this, SLOT(apply_order_to_heaters(void)));
 
-	connect(&m_state_btn, SIGNAL(clicked()), this, SLOT(change_state()));
+	connect(m_state_btn, SIGNAL(clicked()), this, SLOT(change_state()));
 
 	connect(menu_btn, SIGNAL(clicked()), this, SLOT(show_menu()));
 	/*
@@ -235,16 +235,16 @@ void MainWindow::update_state_btn(enum power_states st)
 {
 	switch (st) {
 	case OFF:
-		m_state_btn.setText(tr("Force off"));
+		m_state_btn->setText(tr("Force off"));
 		break;
 	case ON:
-		m_state_btn.setText(tr("Force on"));
+		m_state_btn->setText(tr("Force on"));
 		break;
 	case AUTO:
-		m_state_btn.setText(tr("Auto"));
+		m_state_btn->setText(tr("Auto"));
 		break;
 	default:
-		m_state_btn.setText(tr("Error"));
+		m_state_btn->setText(tr("Error"));
 		break;
 	}
 }