fix log_function_use warning (#3018)

Author: Hk669

autogen/agentchat/conversable_agent.py

@@ -2526,14 +2526,16 @@ def _wrap_function(self, func: F) -> F:
         @functools.wraps(func)
         def _wrapped_func(*args, **kwargs):
             retval = func(*args, **kwargs)
-            log_function_use(self, func, kwargs, retval)
+            if logging_enabled():
+                log_function_use(self, func, kwargs, retval)
             return serialize_to_str(retval)
 
         @load_basemodels_if_needed
         @functools.wraps(func)
         async def _a_wrapped_func(*args, **kwargs):
             retval = await func(*args, **kwargs)
-            log_function_use(self, func, kwargs, retval)
+            if logging_enabled():
+                log_function_use(self, func, kwargs, retval)
             return serialize_to_str(retval)
 
         wrapped_func = _a_wrapped_func if inspect.iscoroutinefunction(func) else _wrapped_func