fix(session): repair systemd power action calls

session/application.h

@@ -39,13 +39,13 @@ public slots:
     }
 
     void reboot() {
-        m_power.reboot();
-        QCoreApplication::exit(0);
+        if (m_power.reboot())
+            QCoreApplication::exit(0);
     }
 
     void powerOff() {
-        m_power.shutdown();
-        QCoreApplication::exit(0);
+        if (m_power.shutdown())
+            QCoreApplication::exit(0);
     }
 
     bool suspend() {

session/powermanager/powerproviders.cpp

@@ -126,7 +126,9 @@ static bool dbusCallSystemd(const QString &service,
         return false;
     }
 
-    QDBusMessage msg = dbus.call(method, needBoolArg ? QVariant(true) : QVariant());
+    const QDBusMessage msg = needBoolArg
+        ? dbus.call(method, QVariant(true))
+        : dbus.call(method);
 
     if (!msg.errorName().isEmpty()) {
         printDBusMsg(msg);