fixed zero gpu check

app.py

@@ -112,6 +112,7 @@ class Args:
 def process_image(image, repaint, busyness):
 
     print("CUDA check:")
+    zero = torch.Tensor([0]).cuda()
     print("   zero.device = ",zero.device)
     accelerator = accelerate.Accelerator()
     device = accelerator.device