scsi: virtio_scsi: Drop DID_TARGET_FAILURE use

DID_TARGET_FAILURE is internal to the SCSI layer. Drivers must not use it
because:

 1. It's not propagated upwards, so SG IO/passthrough users will not see an
    error and think a command was successful.

 2. There is no handling for it in scsi_decide_disposition() so it results
    in entering SCSI error handling.

virtio_scsi gets this when something like qemu returns
VIRTIO_SCSI_S_TARGET_FAILURE.  It looks like qemu returns that error code
if a host OS returns it, but this shouldn't happen for Linux since we never
propagate that error to userspace.

This has us use DID_BAD_TARGET in case some other virt layer is returning
it. In that case we will still get a hard error like before and it conveys
something unexpected happened.

Link: https://lore.kernel.org/r/20220812010027.8251-5-michael.christie@oracle.comAcked-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/virtio_scsi.c

@@ -141,7 +141,7 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
 		set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
 		break;
 	case VIRTIO_SCSI_S_TARGET_FAILURE:
-		set_host_byte(sc, DID_TARGET_FAILURE);
+		set_host_byte(sc, DID_BAD_TARGET);
 		break;
 	case VIRTIO_SCSI_S_NEXUS_FAILURE:
 		set_host_byte(sc, DID_NEXUS_FAILURE);