/*
* Remove a directory entry after a call to namei, using
* the auxiliary results it provided. The entry
* ulr_offset contains the offset into the directory of the
* entry to be eliminated. The ulr_count field contains the
* size of the previous record in the directory. If this
* is 0, the first entry is being deleted, so we need only
* zero the inode number to mark the entry as free. If the
* entry is not the first in the directory, we must reclaim
* the space of the now empty record by adding the record size
* to the size of the previous entry.
*/