There could be memory leaks if ALTER ... PARTITION command fails.

Problem was that the list of items to free was not set in
the partition info structure when fix_partition_func call failed
during ALTER ... PARTITION.

Solved by always setting the list in the partition info struct.

sql/table.cc:
  item_free_list is not set if (!work_part_info_used) and
  fix_partition_func failed. Which may result in a mem leak.