ONNX: Fix FP8 quantization for the second MLP in LayernormMLP

Author: victoroliv2

transformer_engine/pytorch/module/layernorm_mlp.py

@@ -2243,14 +2243,23 @@ def onnx_forward(
 
         assert not TEDebugState.debug_enabled, "Debug mode is not supported in ONNX export"
         assert_warmed_up(self)
+
+        # Get quantizers
         (
             fc1_input_quantizer,
             fc1_weight_quantizer,
+            fc1_output_quantizer,
+            _,
+            _,
+            _,
             fc2_input_quantizer,
             fc2_weight_quantizer,
-            output_quantizer,
-            *_,
+            fc2_output_quantizer,
+            _,
+            _,
+            _,
         ) = self._get_quantizers(False, is_grad_enabled)
+
         inp_dtype = inp.dtype
 
         fc1_weight, fc2_weight = self._get_weight_tensors()
@@ -2324,7 +2333,7 @@ def _clamped_swiglu(x, limit, alpha):
 
         fc2_out = onnx_gemm(fc2_weight, act_out, fc2_bias)
 
-        if output_quantizer is not None:
+        if fc2_output_quantizer is not None:
             raise NotImplementedError("ONNX export of quantized output is not supported")
 
         if self.return_layernorm_output: