Fix attr in check preventing intermingling of querystream and getrow

Author: cjbj

lib/queryStream.js

@@ -98,7 +98,7 @@ class QueryStream extends Readable {
       this.destroy(err);
     } finally {
       this._fetching = false;
-      if (this.resultSet) {
+      if (this._resultSet) {
         this._resultSet._allowGetRowCall = false;
       } else {
         this.emit('_doneFetching');