ide: cleanup ide_set_dma()

* ->dma_off_quietly is always called before ide_set_dma()
  so the call can be moved inside ide_set_dma().

* ide_dma_check() doesn't touch hardware so ->dma_off_quietly
  call for 'rc == -1' case is redundant, remove it.

* '0' and '-1' are the only values returned by ide_dma_check()
  so remove dead code for other cases.

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>

drivers/ide/ide-probe.c

@@ -833,16 +833,8 @@ static void probe_hwif(ide_hwif_t *hwif)
 
 			drive->nice1 = 1;
 
-			if (hwif->ide_dma_on) {
-				/*
-				 * Force DMAing for the beginning of the check.
-				 * Some chipsets appear to do interesting
-				 * things, if not checked and cleared.
-				 *   PARANOIA!!!
-				 */
-				hwif->dma_off_quietly(drive);
+			if (hwif->ide_dma_on)
 				ide_set_dma(drive);
-			}
 		}
 	}