Post-merge patches.


mysql-test/t/disabled.def:
  Disabling test that fails due to no-error patch.
sql/log_event.cc:
  Using definite constant instead of machine-dependent constant.
  Handling case where null_bytes can be zero.
sql/sql_base.cc:
  Using definite constant instead of machine-dependent constant.
sql/sql_class.cc:
  Using definite constant instead of machine-dependent constant.
sql/table.cc:
  Using definite constant instead of machine-dependent constant.