Post-merge fix: Pass the right parameter type to open_and_lock_tables.
Passing FALSE ensures that derived table handling is disabled, truncate
only operates on base tables.

sql/sql_truncate.cc:
  Pass FALSE to disable derived table handling. This was probably
  reminiscent of the use of open_n_lock_single_table, which
  can't be used as in some cases (e.g. merge) more than one
  table will be opened.
sql/sql_truncate.h:
  TABLE_LIST is a struct.