DPL: fix reading of booleans from branches with more than 2 baskets. (#14231)

Author: ktf

Framework/AnalysisSupport/src/TTreePlugin.cxx

@@ -208,7 +208,7 @@ auto readBoolValues = [](uint8_t* target, ReadOps& op, TBufferFile& rootBuffer)
   memset(target, 0, op.targetBuffer->size());
   int readLast = 0;
   while (readEntries < op.rootBranchEntries) {
-    auto beginValue = readLast;
+    auto beginValue = readEntries;
     readLast = op.branch->GetBulkRead().GetBulkEntries(readEntries, rootBuffer);
     int size = readLast * op.listSize;
     readEntries += readLast;