Changed ~Item_func_in() to call cleanup() (to fix memory leak)
Fixed test_multi_statements() test in client_test


include/mysql.h:
  Changed mysql_next_result() to return int instead of bool
libmysql/libmysql.c:
  Changed mysql_next_result() to return int instead of bool
  Added check to mysql_next_result() to ensure that it's not called in wrong context.
sql/item_cmpfunc.cc:
  Indentation fixes
sql/item_cmpfunc.h:
  Changed ~Item_func_in() to call cleanup()
  (Fixed memory leak in cmp_item_row())
tests/client_test.c:
  Fixed test_multi_statements() test.