fix#30092 Kimi-Linear model loading failure with missing indexer_rotary_emb (#30093)

Signed-off-by: baonudesifeizhai <baonudesifeizhai@gmail.com>

vllm/model_executor/layers/mla.py

@@ -24,9 +24,9 @@ class MLAModules:
     q_b_proj: torch.nn.Module | None
     q_proj: torch.nn.Module | None
     indexer: torch.nn.Module | None
-    indexer_rotary_emb: torch.nn.Module | None
     is_sparse: bool
     topk_indices_buffer: torch.Tensor | None
+    indexer_rotary_emb: torch.nn.Module | None = None
 
 
 @CustomOp.register("multi_head_latent_attention")