Don't rely on implicit QScopedPointer to bool conversion

No longer available in Qt6.

src/backends/drm/egl_gbm_layer.cpp

@@ -133,7 +133,7 @@ bool EglGbmLayer::endRendering(const QRegion &damagedRegion)
         m_currentBuffer = buffer;
         m_currentDamage = damagedRegion;
     }
-    return buffer;
+    return !buffer.isNull();
 }
 
 QRegion EglGbmLayer::currentDamage() const

src/backends/wayland/wayland_backend.cpp

@@ -387,12 +387,12 @@ void WaylandInputDevice::setLeds(LEDs leds)
 
 bool WaylandInputDevice::isKeyboard() const
 {
-    return m_keyboard;
+    return !m_keyboard.isNull();
 }
 
 bool WaylandInputDevice::isAlphaNumericKeyboard() const
 {
-    return m_keyboard;
+    return !m_keyboard.isNull();
 }
 
 bool WaylandInputDevice::isPointer() const
@@ -407,7 +407,7 @@ bool WaylandInputDevice::isTouchpad() const
 
 bool WaylandInputDevice::isTouch() const
 {
-    return m_touch;
+    return !m_touch.isNull();
 }
 
 bool WaylandInputDevice::isTabletTool() const

src/effects/screenshot/screenshotdbusinterface1.cpp

@@ -783,7 +783,7 @@ QString ScreenShotDBusInterface1::screenshotArea(int x, int y, int width, int he
 
 bool ScreenShotDBusInterface1::isTakingScreenshot() const
 {
-    return m_source;
+    return !m_source.isNull();
 }
 
 void ScreenShotDBusInterface1::showInfoMessage(InfoMessageMode mode)

src/libkwineffects/kwinoffscreenquickview.cpp

@@ -237,7 +237,7 @@ void OffscreenQuickView::update()
         return;
     }
 
-    bool usingGl = d->m_glcontext;
+    bool usingGl = !d->m_glcontext.isNull();
 
     if (usingGl) {
         if (!d->m_glcontext->makeCurrent(d->m_offscreenSurface.data())) {

src/platformsupport/scenes/opengl/openglsurfacetexture.cpp

@@ -21,7 +21,7 @@ OpenGLSurfaceTexture::~OpenGLSurfaceTexture()
 
 bool OpenGLSurfaceTexture::isValid() const
 {
-    return m_texture;
+    return !m_texture.isNull();
 }
 
 OpenGLBackend *OpenGLSurfaceTexture::backend() const

src/plugins/screencast/screencaststream.cpp

@@ -284,7 +284,7 @@ bool ScreenCastStream::createStream()
     int n_params;
 
     auto canCreateDmaBuf = [this] () -> bool {
-        return QSharedPointer<DmaBufTexture>(kwinApp()->platform()->createDmaBufTexture(m_resolution));
+        return !QSharedPointer<DmaBufTexture>(kwinApp()->platform()->createDmaBufTexture(m_resolution)).isNull();
     };
     const auto format = m_source->hasAlphaChannel() ? SPA_VIDEO_FORMAT_BGRA : SPA_VIDEO_FORMAT_BGR;