UI: remove unused lock and fence (#24355)

selfdrive/ui/qt/widgets/cameraview.cc

@@ -214,16 +214,9 @@ void CameraViewWidget::paintGL() {
   glClearColor(bg.redF(), bg.greenF(), bg.blueF(), bg.alphaF());
   glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 
-  std::lock_guard lk(lock);
-
   if (latest_frame == nullptr) return;
 
   glViewport(0, 0, width(), height());
-  // sync with the PBO
-  if (wait_fence) {
-    wait_fence->wait();
-  }
-
   glBindVertexArray(frame_vao);
 
   glUseProgram(program->programId());

selfdrive/ui/qt/widgets/cameraview.h

@@ -35,19 +35,10 @@ protected:
   virtual void updateFrameMat(int w, int h);
   void vipcThread();
 
-  struct WaitFence {
-    WaitFence() { sync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0); }
-    ~WaitFence() { glDeleteSync(sync); }
-    void wait() { glWaitSync(sync, 0, GL_TIMEOUT_IGNORED); }
-    GLsync sync = 0;
-  };
-
   bool zoomed_view;
-  std::mutex lock;
   VisionBuf *latest_frame = nullptr;
   GLuint frame_vao, frame_vbo, frame_ibo;
   mat4 frame_mat;
-  std::unique_ptr<WaitFence> wait_fence;
   std::unique_ptr<QOpenGLShaderProgram> program;
   QColor bg = QColor("#000000");