fix accountTx ref counting

reporting/ReportingBackend.cpp

@@ -241,7 +241,9 @@ flatMapWriteAccountTxCallback(CassFuture* fut, void* cbData)
         backend.throttleCv_.notify_all();
         if (backend.numRequestsOutstanding_ == 0)
             backend.syncCv_.notify_all();
-        delete &requestParams;
+        int remaining = --requestParams.refs;
+        if (remaining == 0)
+            delete &requestParams;
     }
 }
 void

reporting/ReportingBackend.h

@@ -1378,11 +1378,12 @@ public:
         AccountTransactionsData data;
 
         uint32_t currentRetries = 0;
+        std::atomic<int> refs;
 
         WriteAccountTxCallbackData(
             CassandraFlatMapBackend const* f,
             AccountTransactionsData&& data)
-            : backend(f), data(std::move(data))
+            : backend(f), data(std::move(data)), refs(data.accounts.size())
         {
         }
     };