ide: make void and rename ide_dma_lostirq() method

Since ide_dma_lostirq() method's result is discarded, make it return 'void'.
While at it, rename the method to dma_lost_irq(), drop the '__' prefix from the
default method's name, and do some cleanups in this method driver-wise:

- in aec62xx.c, rename the method in accordance with other drivers, and get rid
  of unnecessary variables there;

- in pdc202xx_old.c, define/use 'hwif' variable;

- in sgiioc4.c, rearrange the code to call the resetproc() method directly.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/mips/au1xxx-ide.c

@@ -456,10 +456,9 @@ static void auide_dma_off_quietly(ide_drive_t *drive)
 	drive->using_dma = 0;
 }
 
-static int auide_dma_lostirq(ide_drive_t *drive)
+static void auide_dma_lost_irq(ide_drive_t *drive)
 {
 	printk(KERN_ERR "%s: IRQ lost\n", drive->name);
-	return 0;
 }
 
 static void auide_ddma_tx_callback(int irq, void *param)
@@ -731,7 +730,7 @@ static int au_ide_probe(struct device *dev)
 	hwif->ide_dma_test_irq          = &auide_dma_test_irq;
 	hwif->dma_host_off		= &auide_dma_host_off;
 	hwif->dma_host_on		= &auide_dma_host_on;
-	hwif->ide_dma_lostirq           = &auide_dma_lostirq;
+	hwif->dma_lost_irq		= &auide_dma_lost_irq;
 	hwif->ide_dma_on                = &auide_dma_on;
 
 	hwif->autodma                   = 1;