fix error nesting

mev_inspect/arbitrages.py

@@ -52,14 +52,13 @@ def _get_arbitrages_from_swaps(swaps: List[Swap]) -> List[Arbitrage]:
         ]
         routes = _get_all_routes(start, end, potential_intermediate_swaps)
 
-        error = None
-
         for route in routes:
             start_amount = route[0].token_in_amount
             end_amount = route[-1].token_out_amount
             profit_amount = end_amount - start_amount
 
             for swap in route:
+                error = None
                 if swap.error is not None:
                     error = swap.error