KWinWaylandBackend: fix a few warnings in findDevices

kcms/mouse/backends/kwin_wl/kwin_wl_backend.cpp

@@ -54,17 +54,17 @@ KWinWaylandBackend::~KWinWaylandBackend()
 void KWinWaylandBackend::findDevices()
 {
     QStringList devicesSysNames;
-    const QVariant reply = m_deviceManager->property("devicesSysNames");
-    if (reply.isValid()) {
+    const QVariant replyDevicesSysNames = m_deviceManager->property("devicesSysNames");
+    if (replyDevicesSysNames.isValid()) {
         qCDebug(KCM_MOUSE) << "Devices list received successfully from KWin.";
-        devicesSysNames = reply.toStringList();
+        devicesSysNames = replyDevicesSysNames.toStringList();
     } else {
         qCCritical(KCM_MOUSE) << "Error on receiving device list from KWin.";
         m_errorString = i18n("Querying input devices failed. Please reopen this settings module.");
         return;
     }
 
-    for (QString sn : devicesSysNames) {
+    for (const QString &sn : qAsConst(devicesSysNames)) {
         QDBusInterface deviceIface(QStringLiteral("org.kde.KWin"),
                                    QStringLiteral("/org/kde/KWin/InputDevice/") + sn,
                                    QStringLiteral("org.kde.KWin.InputDevice"),

kcms/mouse/backends/kwin_wl/kwin_wl_device.cpp

@@ -58,7 +58,7 @@ Qt::MouseButtons valueLoaderPart(QVariant const &reply)
 }
 }
 
-KWinWaylandDevice::KWinWaylandDevice(QString dbusName)
+KWinWaylandDevice::KWinWaylandDevice(const QString &dbusName)
 {
     m_iface = new QDBusInterface(QStringLiteral("org.kde.KWin"),
                                  QStringLiteral("/org/kde/KWin/InputDevice/") + dbusName,

kcms/mouse/backends/kwin_wl/kwin_wl_device.h

@@ -57,7 +57,7 @@ class KWinWaylandDevice : public QObject
     Q_PROPERTY(qreal scrollFactor READ scrollFactor WRITE setScrollFactor NOTIFY scrollFactorChanged)
 
 public:
-    KWinWaylandDevice(QString dbusName);
+    KWinWaylandDevice(const QString &dbusName);
     ~KWinWaylandDevice() override;
 
     bool init();