[libata] pata_atiixp: fix PIO timing data misprogramming

Use correct variable, achieve desired result...

Spotted by LKML/linux-ide poster whose name I lost (apologies!)
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/pata_atiixp.c

@@ -88,8 +88,8 @@ static void atiixp_set_pio_timing(struct ata_port *ap, struct ata_device *adev,
 	pci_write_config_word(pdev, ATIIXP_IDE_PIO_MODE, pio_mode_data);
 
 	pci_read_config_word(pdev, ATIIXP_IDE_PIO_TIMING, &pio_timing_data);
-	pio_mode_data &= ~(0xFF << timing_shift);
-	pio_mode_data |= (pio_timings[pio] << timing_shift);
+	pio_timing_data &= ~(0xFF << timing_shift);
+	pio_timing_data |= (pio_timings[pio] << timing_shift);
 	pci_write_config_word(pdev, ATIIXP_IDE_PIO_TIMING, pio_timing_data);
 }