ide: merge ->dma_host_{on,off} methods into ->dma_host_set method

Merge ->dma_host_{on,off} methods into ->dma_host_set method
which takes 'int on' argument.

There should be no functionality changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index b5a7d25..e37b09c 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -219,7 +219,7 @@
 		 * we could be smarter and check for current xfer_speed
 		 * in struct drive etc...
 		 */
-		if (drive->hwif->dma_host_on == NULL)
+		if (drive->hwif->dma_host_set == NULL)
 			break;
 		/*
 		 * TODO: respect ->using_dma setting