wrong word count in ZDC LUCROD decoding demoted to WARNING

This is a fix to https://its.cern.ch/jira/browse/ATLASRECTS-7737

It limits the severity of the wrong word count to WARNING, but also reports an incomplete fillContainer (i.e. <6 LUCRODs) as a StatusCode::FAILURE, again leading to a warning.

There may be more status info needed to be passed down, but this keeps the issue moving forward.

ForwardDetectors/ZDC/ZdcCnv/ZdcByteStream/src/ZdcByteStreamLucrodData.cxx

@@ -78,7 +78,7 @@ StatusCode ZdcByteStreamLucrodData::fillContainer(std::vector<const ROBFragment*
   
   ATH_MSG_DEBUG(" ZdcByteStreamLucrodData::fillContainer ");
  
-  int nFragments = listOfRobf.size();
+  size_t nFragments = listOfRobf.size();
     
   ATH_MSG_DEBUG(" Number of ROB fragments: " << nFragments);
   
@@ -107,7 +107,11 @@ StatusCode ZdcByteStreamLucrodData::fillContainer(std::vector<const ROBFragment*
 
   for (auto zld : *zdcLucrodDataContainer) {zld->str();}
 
-  return StatusCode::SUCCESS;
+  if (zdcLucrodDataContainer->size() == nFragments)
+    return StatusCode::SUCCESS;
+  else
+    return StatusCode::FAILURE;
+
 }
 
 StatusCode ZdcByteStreamLucrodData::finalize() {