libata-core: kill duplicate statement in ata_do_set_mode()

Commit b3a70601 (libata: Add a
drivers/ide style DMA disable) neglected to remove the line in
ata_do_set_mode() it has obviously made useless/duplicated.  Do this
now, and make a line added back then wrapped properly...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/libata-core.c

@@ -3249,10 +3249,10 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
 		ata_force_xfermask(dev);
 
 		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
-		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
 
 		if (libata_dma_mask & mode_mask)
-			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
+			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
+						     dev->udma_mask);
 		else
 			dma_mask = 0;