Set AvailableStepsCount to 1 with SST engine

source/adios2/engine/sst/SstReader.cpp

@@ -41,6 +41,7 @@ SstReader::SstReader(IO &io, const std::string &name, const Mode mode,
         Variable<T> *variable =                                                \
             &(Reader->m_IO.DefineVariable<T>(variableName));                   \
         variable->SetData((T *)data);                                          \
+        variable->m_AvailableStepsCount = 1;                                   \
         return (void *)variable;                                               \
     }
 
@@ -74,6 +75,7 @@ SstReader::SstReader(IO &io, const std::string &name, const Mode mode,
     {                                                                          \
         Variable<T> *variable = &(Reader->m_IO.DefineVariable<T>(              \
             variableName, VecShape, VecStart, VecCount));                      \
+        variable->m_AvailableStepsCount = 1;                                   \
         return (void *)variable;                                               \
     }
         ADIOS2_FOREACH_TYPE_1ARG(declare_type)