Refs #3203: Fix occasional segfault in ConvertToMatrixWorkspaceTest due to a...

Refs #3203: Fix occasional segfault in ConvertToMatrixWorkspaceTest due to a little error in CRITICAL block names for OpenMP thread safety. One character fix :)

Code/Mantid/Framework/DataObjects/src/EventWorkspaceMRU.cpp

@@ -133,7 +133,7 @@ namespace DataObjects
   MantidVecWithMarker * EventWorkspaceMRU::findE(size_t thread_num, size_t index)
   {
     MantidVecWithMarker * out;
-    PARALLEL_CRITICAL(EventWorkspace_MRUY_access)
+    PARALLEL_CRITICAL(EventWorkspace_MRUE_access)
     {
       out = m_bufferedDataE[thread_num]->find(index);
     }