scsi: libsas: Fix an error code in sas_ata_add_dev()

This code accidentally returns success instead of -ENOMEM.

Fixes: 7cc7646 ("scsi: libsas: Factor out sas_ata_add_dev()")
Link: https://lore.kernel.org/r/Y7asLxzVwQ56G+ya@kili
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/libsas/sas_ata.c

@@ -716,7 +716,7 @@ int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
 
 	rphy = sas_end_device_alloc(phy->port);
 	if (!rphy)
-		return ret;
+		return -ENOMEM;
 
 	rphy->identify.phy_identifier = phy_id;
 	child->rphy = rphy;