Update optimum/gptq/quantizer.py

Co-authored-by: Ilyas Moutawwakil <57442720+IlyasMoutawwakil@users.noreply.github.com>

Author: jiqing-feng

optimum/gptq/quantizer.py

@@ -702,7 +702,7 @@ def tmp(_, input, output):
         model = self.post_init_model(model)
 
         torch.cuda.empty_cache()
-        if hasattr(torch, "xpu"):
+        if hasattr(torch, "xpu") and torch.xpu.is_available():
             torch.xpu.empty_cache()
         return model