fix KarrasVePipeline bug (huggingface#2828)

Author: junhsss

pipelines/stochastic_karras_ve/pipeline_stochastic_karras_ve.py

@@ -120,7 +120,7 @@ def __call__(
         sample = (sample / 2 + 0.5).clamp(0, 1)
         image = sample.cpu().permute(0, 2, 3, 1).numpy()
         if output_type == "pil":
-            image = self.numpy_to_pil(sample)
+            image = self.numpy_to_pil(image)
 
         if not return_dict:
             return (image,)