fix: remove duplicate engine_id check in nixl_connector (#31948)

Signed-off-by: Bofeng BF1 Xue <xuebf1@Lenovo.com>
Co-authored-by: Bofeng BF1 Xue <xuebf1@Lenovo.com>

vllm/distributed/kv_transfer/kv_connector/v1/nixl_connector.py

@@ -1077,13 +1077,6 @@ class NixlConnectorWorker:
                     ) from e
 
                 # Ensure engine id matches.
-                if metadata.engine_id != expected_engine_id:
-                    raise RuntimeError(
-                        f"Remote NIXL agent engine ID mismatch. "
-                        f"Expected {expected_engine_id},"
-                        f"received {metadata.engine_id}."
-                    )
-                # Ensure engine id matches.
                 if metadata.engine_id != expected_engine_id:
                     raise RuntimeError(
                         f"Remote NIXL agent engine ID mismatch. "