Fix edge case for truncated (#1747)

python/sglang/srt/managers/scheduler.py

@@ -416,7 +416,7 @@ class Scheduler:
                 )
 
         # Truncate prompts that are too long
-        if len(req.origin_input_ids) >= self.max_req_input_len:
+        if len(req.origin_input_ids) > self.max_req_input_len:
             logger.warning(
                 "Request length is longer than the KV cache pool size or "
                 "the max context length. Truncated!!!"