fix security issue of logging llm output (#18980)

Signed-off-by: Lu Fang <fanglu@fb.com>
Co-authored-by: Lucia (Lu) Fang <fanglu@meta.com>

vllm/entrypoints/openai/tool_parsers/phi4mini_tool_parser.py

@@ -68,8 +68,8 @@ class Phi4MiniJsonToolParser(ToolParser):
                              len(function_call_arr))
             except json.JSONDecodeError as e:
                 logger.error(
-                    "Failed to parse function calls from model output: %s. "
-                    "Error: %s", model_output, str(e))
+                    "Failed to parse function calls from model output. "
+                    "Error: %s", str(e))
 
             tool_calls: list[ToolCall] = [
                 ToolCall(