ui/cameraview: fix deadlock on exit due to Qt::BlockingQueuedConnection (#32620)

fix deadlock

selfdrive/ui/qt/widgets/cameraview.cc

@@ -11,6 +11,7 @@
 #include <string>
 #include <utility>
 
+#include <QApplication>
 #include <QOpenGLBuffer>
 #include <QOffscreenSurface>
 
@@ -104,6 +105,7 @@ CameraWidget::CameraWidget(std::string stream_name, VisionStreamType type, bool
   QObject::connect(this, &CameraWidget::vipcThreadConnected, this, &CameraWidget::vipcConnected, Qt::BlockingQueuedConnection);
   QObject::connect(this, &CameraWidget::vipcThreadFrameReceived, this, &CameraWidget::vipcFrameReceived, Qt::QueuedConnection);
   QObject::connect(this, &CameraWidget::vipcAvailableStreamsUpdated, this, &CameraWidget::availableStreamsUpdated, Qt::QueuedConnection);
+  QObject::connect(QApplication::instance(), &QCoreApplication::aboutToQuit, this, &CameraWidget::stopVipcThread);
 }
 
 CameraWidget::~CameraWidget() {