[Bugfix] Fix typo in Qwen3 Next model executor (#28960)

Signed-off-by: Gleb Kurchanov <nepherpitou@gmail.com>

vllm/model_executor/models/qwen3_next.py

@@ -1154,8 +1154,8 @@ class QwenNextMixtureOfExperts(MixtureOfExperts):
                 example_moe = layer.mlp
                 self.moe_layers.append(layer.mlp.experts)
 
-            if example_moe is None:
-                raise RuntimeError("No Qwen3Next layer found in the model.layers.")
+        if example_moe is None:
+            raise RuntimeError("No Qwen3Next layer found in the model.layers.")
 
         # Set MoE hyperparameters
         self.num_moe_layers = len(self.moe_layers)