[SCSI] scsi_transport_sas: don't scan a non-existent end device

Any end device that can't support any of the scanning protocols
shouldn't be scanned, so set its id to -1 to prevent
scsi_scan_target() being called for it.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_transport_sas.c

@@ -845,6 +845,8 @@ int sas_rphy_add(struct sas_rphy *rphy)
 	    (identify->target_port_protocols &
 	     (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
 		rphy->scsi_target_id = sas_host->next_target_id++;
+	else if (identify->device_type == SAS_END_DEVICE)
+		rphy->scsi_target_id = -1;
 	mutex_unlock(&sas_host->lock);
 
 	if (identify->device_type == SAS_END_DEVICE &&