fix assert statement that always evaluates to true

xinference/client/tests/test_client.py

@@ -274,7 +274,9 @@ def _check_stream():
             generate_config={"stream": True, "max_tokens": 5},
         )
         for chunk in streaming_response:
-            assert "content" or "role" in chunk["choices"][0]["delta"]
+            assert ("content" in chunk["choices"][0]["delta"]) or (
+                "role" in chunk["choices"][0]["delta"]
+            )
 
     _check_stream()