Update qiskit/transpiler/passes/routing/stochastic_swap.py

Co-authored-by: Jake Lishman <[email protected]>

qiskit/transpiler/passes/routing/stochastic_swap.py

@@ -99,9 +99,8 @@ def run(self, dag):
             raise TranspilerError("The layout does not match the amount of qubits in the DAG")
 
         canonical_register = dag.qregs["q"]
-        self.trivial_layout = Layout.generate_trivial_layout(canonical_register)
         if self.initial_layout is None:
-            self.initial_layout = self.trivial_layout
+            self.initial_layout = Layout.generate_trivial_layout(canonical_register)
         self._qubit_indices = {bit: idx for idx, bit in enumerate(dag.qubits)}
 
         self.qregs = dag.qregs