[ide] fix hwif_init() to not return error for "empty" interfaces

Return success if no device is connected to the interface.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-probe.c

@@ -1248,8 +1248,9 @@ static int hwif_init(ide_hwif_t *hwif)
 {
 	int old_irq, unit;
 
+	/* Return success if no device is connected */
 	if (!hwif->present)
-		return 0;
+		return 1;
 
 	if (!hwif->irq) {
 		if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))