ide: use ide_destroy_dmatable() instead of pci_unmap_sg() (take 2)

Use ide_destroy_dmatable() in:
* ide-dma.c::ide_build_dmatable()
* sgiioc4.c::sgiioc4_build_dma_table()
* pmac.c::pmac_ide_{build,destroy}_dmatable()

There should be no functionality changes caused by this patch.

v2:
* pmac.c build fix from Andrew Morton.

Cc: Sergei Shtylyov <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>

drivers/ide/ide-dma.c

···
 			*--table |= cpu_to_le32(0x80000000);
 		return count;
 	}
+
 	printk(KERN_ERR "%s: empty DMA table?\n", drive->name);
+
 use_pio_instead:
-	pci_unmap_sg(hwif->pci_dev,
-		     hwif->sg_table,
-		     hwif->sg_nents,
-		     hwif->sg_dma_direction);
+	ide_destroy_dmatable(drive);
+
 	return 0; /* revert to PIO for this request */
 }
 

drivers/ide/pci/sgiioc4.c

···
 	}
 
 use_pio_instead:
-	pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
-		     hwif->sg_dma_direction);
+	ide_destroy_dmatable(drive);
 
 	return 0;		/* revert to PIO for this request */
 }

drivers/ide/ppc/pmac.c

···
 	}
 
 	printk(KERN_DEBUG "%s: empty DMA table?\n", drive->name);
- use_pio_instead:
-	pci_unmap_sg(hwif->pci_dev,
-		     hwif->sg_table,
-		     hwif->sg_nents,
-		     hwif->sg_dma_direction);
+
+use_pio_instead:
+	ide_destroy_dmatable(drive);
+
 	return 0; /* revert to PIO for this request */
 }
 
···
 pmac_ide_destroy_dmatable (ide_drive_t *drive)
 {
 	ide_hwif_t *hwif = drive->hwif;
-	struct pci_dev *dev = HWIF(drive)->pci_dev;
-	struct scatterlist *sg = hwif->sg_table;
-	int nents = hwif->sg_nents;
 
-	if (nents) {
-		pci_unmap_sg(dev, sg, nents, hwif->sg_dma_direction);
+	if (hwif->sg_nents) {
+		ide_destroy_dmatable(drive);
 		hwif->sg_nents = 0;
 	}
 }