Don't bother retrying errors for encrypted drives that are locked.

sys/cam/scsi/scsi_all.c:
	In the asc_table, if we get a 0x20,0x02 error ("Access denied -
	no access rights"), don't bother retrying.  Instead, immediately
	fail the command.

	This is the error returned by Self Encrypting Drives (SED) when
	they are locked.