record-client.c: Unchecked return value error spotted by Coverity

Original author: rlong

CID 1503011: Unchecked return value in resolve_hold_back().

191    for ( index = begin_index; index < per_cpu->item_index; ++index ) {
192      const rtems_record_item_64 *item;
193
194      item = &per_cpu->items[ index ];
   CID 1503011 (#1 of 1): Unchecked return value (CHECKED_RETURN)12. check_return: Calling visit without checking return value (as is done elsewhere 4 out of 5 times).
195      visit( ctx, item->event, item->data );