libata: remove ata_is_nodata

The only caller can just check for !ata_is_data instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 522848a..0749f71 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5044,7 +5044,7 @@
 {
 	struct ata_device *dev = qc->dev;
 
-	if (ata_is_nodata(qc->tf.protocol))
+	if (!ata_is_data(qc->tf.protocol))
 		return;
 
 	if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))