ide: sanitize ide_build_sglist() and ide_destroy_dmatable()

* Move ide_map_sg() calls out from ide_build_sglist()
  to ide_dma_prepare().

* Pass command to ide_destroy_dmatable().

* Rename ide_build_sglist() to ide_dma_map_sg()
  and ide_destroy_dmatable() to ide_dma_unmap_sg().

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/sgiioc4.c b/drivers/ide/sgiioc4.c
index cb2657c..6ef5a56 100644
--- a/drivers/ide/sgiioc4.c
+++ b/drivers/ide/sgiioc4.c
@@ -277,11 +277,12 @@
 		sgiioc4_clearirq(drive);
 }
 
-static void
-sgiioc4_resetproc(ide_drive_t * drive)
+static void sgiioc4_resetproc(ide_drive_t *drive)
 {
+	struct ide_cmd *cmd = &drive->hwif->cmd;
+
 	sgiioc4_dma_end(drive);
-	ide_destroy_dmatable(drive);
+	ide_dma_unmap_sg(drive, cmd);
 	sgiioc4_clearirq(drive);
 }