swapd error on subcommand (#311)

ethereum/extethclient/eth_wallet_client.go

@@ -162,7 +162,7 @@ func (c *ethClient) SetGasPrice(gasPrice uint64) {
 		c.gasPrice = nil
 		return
 	}
-	c.gasPrice = big.NewInt(0).SetUint64(gasPrice)
+	c.gasPrice = new(big.Int).SetUint64(gasPrice)
 }
 
 // SetGasLimit sets the ethereum gas limit to use (in wei). In most cases you should not

ethereum/watcher/watcher.go

@@ -96,7 +96,7 @@ func (f *EventFilter) Start() error {
 			}
 
 			// the filter is inclusive of the latest block when `ToBlock` is nil, so we add 1
-			f.filterQuery.FromBlock = big.NewInt(0).Add(currHeader.Number, big.NewInt(1))
+			f.filterQuery.FromBlock = new(big.Int).Add(currHeader.Number, big.NewInt(1))
 			header = currHeader
 		}
 	}()