Sleep on tx confirmation check only if it's not confirmed yet.

iguana/exchanges/etomicswap/etomiccurl.c

@@ -293,16 +293,18 @@ int32_t waitForConfirmation(char *txId)
     EthTxReceipt receipt;
     EthTxData txData;
     do {
-        sleep(15);
-        printf("waiting for ETH txId to be confirmed: %s\n", txId);
         receipt = getEthTxReceipt(txId);
         if (receipt.confirmations < 1) {
             txData = getEthTxData(txId);
             if (txData.exists == 0) {
                 return(-1);
             }
+        } else {
+            break;
         }
-    } while (receipt.confirmations < 1);
+        printf("waiting for ETH txId to be confirmed: %s\n", txId);
+        sleep(15);
+    } while (1);
 
     if (strcmp(receipt.status, "0x1") != 0) {
         printf("ETH txid %s receipt status failed\n", txId);