[libata] fix build error on drivers/ata/pata_legacy.c

fix those errors:

drivers/ata/pata_legacy.c: In function ‘pdc_data_xfer_vlb’:
drivers/ata/pata_legacy.c:289: error: ‘ap’ undeclared (first use in this function)
drivers/ata/pata_legacy.c:289: error: (Each undeclared identifier is reported only once
drivers/ata/pata_legacy.c:289: error: for each function it appears in.)
drivers/ata/pata_legacy.c: At top level:
drivers/ata/pata_legacy.c:869: error: ‘ATA_PFLAG_PIO32_CHANGE’ undeclared here (not in a
+function)
make[2]: *** [drivers/ata/pata_legacy.o] Error 1
make[1]: *** [drivers/ata] Error 2

Signed-off-by: Zhenwen Xu <helight.xu@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/pata_legacy.c

@@ -285,10 +285,11 @@ static unsigned int pdc_data_xfer_vlb(struct ata_device *dev,
 			unsigned char *buf, unsigned int buflen, int rw)
 {
 	int slop = buflen & 3;
+	struct ata_port *ap = dev->link->ap;
+
 	/* 32bit I/O capable *and* we need to write a whole number of dwords */
 	if (ata_id_has_dword_io(dev->id) && (slop == 0 || slop == 3)
 					&& (ap->pflags & ATA_PFLAG_PIO32)) {
-		struct ata_port *ap = dev->link->ap;
 		unsigned long flags;
 
 		local_irq_save(flags);
@@ -866,7 +867,7 @@ static struct legacy_controller controllers[] = {
 			0,			0,			NULL },
 	{"PDC20230",	&pdc20230_port_ops,	0x7,
 			ATA_FLAG_NO_IORDY,
-			ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32_CHANGE,	NULL },
+			ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE,	NULL },
 	{"HT6560A",	&ht6560a_port_ops,	0x07,
 			ATA_FLAG_NO_IORDY,	0,			NULL },
 	{"HT6560B",	&ht6560b_port_ops,	0x1F,
@@ -877,13 +878,13 @@ static struct legacy_controller controllers[] = {
 			0,			0,			NULL },
 	{"QDI6500",	&qdi6500_port_ops,	0x07,
 			ATA_FLAG_NO_IORDY,
-			ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32_CHANGE,    qdi_port },
+			ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE,    qdi_port },
 	{"QDI6580",	&qdi6580_port_ops,	0x1F,
-			0, ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32_CHANGE, qdi_port },
+			0, ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE, qdi_port },
 	{"QDI6580DP",	&qdi6580dp_port_ops,	0x1F,
-			0, ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32_CHANGE, qdi_port },
+			0, ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE, qdi_port },
 	{"W83759A",	&winbond_port_ops,	0x1F,
-			0, ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32_CHANGE,
+			0, ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE,
 								winbond_port }
 };