Refactor: reuse HfApi instance for endpoint

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Signed-off-by: Shuting Zhao <shuting.zhao@outlook.com>

Author: stzoozz

src/llmcompressor/transformers/utils/helpers.py

@@ -150,8 +150,8 @@ def recipe_from_huggingface_model_id(
         return None
 
     # Use custom HF_ENDPOINT
-    hf_endpoint = HfApi().endpoint.rstrip("/")
-    model_id_url = f"{hf_endpoint}/{hf_stub}"
+    hf_api = HfApi()
+    model_id_url = f"{hf_api.endpoint.rstrip('/')}/{hf_stub}"
     request = requests.head(model_id_url)
 
     if request.status_code != 200: