ide: fix IDE_HFLAG_NO_ATAPI_DMA handling in config_drive_for_dma()

commit 33c1002 incorrectly changed return
value from '0' to '-1', fix it (ns87415 was the only host driver affected
since it uses both IDE_HFLAG_TRUST_BIOS_FOR_DMA and IDE_HFLAG_NO_ATAPI_DMA).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-dma.c

@@ -340,7 +340,7 @@ static int config_drive_for_dma (ide_drive_t *drive)
 
 	if (drive->media != ide_disk) {
 		if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA)
-			return -1;
+			return 0;
 	}
 
 	/*