mysys/my_alloc.c:
  Added comment for free_root
sql/filesort.cc:
  Removed valgrind warning
sql/sql_select.cc:
  Remove not needed my_casedn_str() for internal files
  (Old code actually didn't do any god as it was accessing not used memory)
sql/sql_view.cc:
  Removed access to uninitialized memory
sql/table.cc:
  Cleanup of error handling