{   The purpose of this procedure is to finish deactivating a file in device
{ management.  This is essentially the same as dmp$delete_file_descriptor except
{ for decrementing the dfd delete count.  Dmp$delete_file_descriptor was called, but
{ the fde open count was not zero at that time so the fde could not be freed.
{ (There were instances of open for this segment that BAM did not known about - i.e.
{ LOADER files.)  Task termination is now in progress and the open count has gone to
{ zero.  This procedure is only called by mmp$invalidate_segment.
{
{   DMP$MM_LOG_SFT_DELETE (SYSTEM_FILE_ID, STATUS);
{
{   SYSTEM_FILE_ID: (input) This parameter specifies the file to delete.
{
{   STATUS: (output) This parameter returns the request status.
{
