Merge branch 'master-dq-offline-lbrange' of...

Merge branch 'master-dq-offline-lbrange' of https://gitlab.cern.ch:8443/ponyisi/athena into master-dq-offline-lbrange

Control/AthenaMonitoringKernel/src/HistogramFiller/OfflineHistogramProvider.h

@@ -75,7 +75,7 @@ namespace Monitored {
       if ( period == HistogramDef::RunPeriod::Run ) {
         lbString = "";
       } else if ( period == HistogramDef::RunPeriod::LowStat ) {
-        const unsigned lbBase = lumiBlock-((lumiBlock-1)%20);
+        const unsigned lbBase = lumiBlock-(((int64_t)lumiBlock-1)%20);
         lbString = "/lowStat_LB"+std::to_string(lbBase)+"-"+std::to_string(lbBase+19);
       } else {
         lbString = "/lb_"+std::to_string(lumiBlock);