[fix]修复test_spec_decode_worker中的错误

vllm/spec_decode/spec_decode_worker.py

@@ -550,6 +550,7 @@ class SpecDecodeWorker(LoraNotSupportedWorkerBase):
                     hidden_states, execute_model_req.seq_group_metadata_list)
                 
         # Store logits from target model execution.
+        if self.tree_style_spec_decoding:
             logits = sampler_output.logits
             if logits is not None:
                 if self.previous_logits is None: