[Bugfix] fix qwen3-next crash (#28202)

Signed-off-by: zjy0516 <riverclouds.zhu@qq.com>

vllm/model_executor/models/qwen3_next.py

@@ -587,7 +587,7 @@ class Qwen3NextGatedDeltaNet(nn.Module, MambaBase):
                 self.conv1d.bias,
                 self.activation,
                 conv_state_indices=non_spec_state_indices_tensor[
-                    : attn_metadata.num_decodes
+                    : attn_metadata.num_actual_tokens
                 ],
                 validate_data=True,
             )