Use unused prepare_img() function in dinov2 conversion script (#31335)

src/transformers/models/dinov2/convert_dinov2_to_hf.py

@@ -138,7 +138,7 @@ def read_in_q_k_v(state_dict, config):
 # We will verify our results on an image of cute cats
 def prepare_img():
     url = "http://images.cocodataset.org/val2017/000000039769.jpg"
-    image = Image.open(requests.get(url, stream=True).raw)
+    image = Image.open(requests.get(url, stream=True).raw).convert("RGB")
     return image
 
 
@@ -190,8 +190,7 @@ def convert_dinov2_checkpoint(model_name, pytorch_dump_folder_path, push_to_hub=
         model.load_state_dict(state_dict)
 
     # load image
-    url = "http://images.cocodataset.org/val2017/000000039769.jpg"
-    image = Image.open(requests.get(url, stream=True).raw).convert("RGB")
+    image = prepare_img()
 
     # preprocess image
     transformations = transforms.Compose(