[Improvement] Fix a potential problem when editing an existing mysql data source

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/DataSourceServiceImpl.java

@@ -158,7 +158,7 @@ public class DataSourceServiceImpl extends BaseServiceImpl implements DataSource
 
         Result<Object> isConnection = checkConnection(dataSource.getType(), connectionParam);
         if (Status.SUCCESS.getCode() != isConnection.getCode()) {
-            return result;
+            return isConnection;
         }
 
         Date now = new Date();