[Bugfix] Fix use_direct_call condition in FusedMoE layer for (#14382)

Signed-off-by: Tyler Michael Smith <tyler@neuralmagic.com>

vllm/model_executor/layers/fused_moe/layer.py

@@ -359,7 +359,7 @@ class FusedMoE(torch.nn.Module):
 
         # For smuggling this layer into the fused moe custom op
         self.use_direct_call = self.dp_size == 1
-        if self.use_direct_call:
+        if not self.use_direct_call:
             compilation_config = vllm_config.compilation_config
             if prefix in compilation_config.static_forward_context:
                 raise ValueError("Duplicate layer name: {}".format(prefix))