ide: __ide_dma_end() -> ide_dma_end()

While at it:
- use EXPORT_SYMBOL_GPL() to match the rest of SFF DMA functions

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/it821x.c b/drivers/ide/pci/it821x.c
index ae7e742..995e18b 100644
--- a/drivers/ide/pci/it821x.c
+++ b/drivers/ide/pci/it821x.c
@@ -385,7 +385,7 @@
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct it821x_dev *itdev = ide_get_hwifdata(hwif);
-	int ret = __ide_dma_end(drive);
+	int ret = ide_dma_end(drive);
 	u8 unit = drive->dn & 1;
 
 	if(itdev->mwdma[unit] != MWDMA_OFF)