libata: convert NCQ test in ata_qc_issue() to ata_is_ncq()

I missed one while converting to ata_is_*() protocol test helpers.
Convert it.  Pointed out by Jeff Garzik.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f01c173..2b57547 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5990,7 +5990,7 @@
 	 */
 	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
 
-	if (prot == ATA_PROT_NCQ) {
+	if (ata_is_ncq(prot)) {
 		WARN_ON(link->sactive & (1 << qc->tag));
 
 		if (!link->sactive)