storage engines do not set the unused null bits (i.e., the
filler bits and the X bit) correctly. Also adding some casts
to debug printouts to eliminate compiler warnings.


sql/ha_ndbcluster.cc:
  Changing debug enter names to use full names for member functions.
sql/records.cc:
  Emptying records before starting to read records since some engines do
  not set the unused null bits, leading to valgrind errors.
sql/rpl_record.cc:
  Adding casts to debug printouts to eliminate compiler warnings.