libata: kill ata_chk_status()

ata_chk_status() just calls ops->check_status and it only adds
confusion with other status functions.  Kill it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/pata_scc.c b/drivers/ata/pata_scc.c
index 07f2d7a..85d3363 100644
--- a/drivers/ata/pata_scc.c
+++ b/drivers/ata/pata_scc.c
@@ -854,7 +854,7 @@
 	 * ATA_NIEN manipulation.  Also, many controllers fail to mask
 	 * previously pending IRQ on ATA_NIEN assertion.  Clear it.
 	 */
-	ata_chk_status(ap);
+	ap->ops->check_status(ap);
 
 	ap->ops->irq_clear(ap);
 }