[libata] init probe_ent->private_data in a common location

Don't write the same code twice, in two different functions, when they
both call the same initialization function, with the same private_data
pointer info.

Also, note a bug found with a FIXME.
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-core.c

@@ -5785,6 +5785,7 @@ ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
 	probe_ent->mwdma_mask = port->mwdma_mask;
 	probe_ent->udma_mask = port->udma_mask;
 	probe_ent->port_ops = port->port_ops;
+	probe_ent->private_data = port->private_data;
 
 	return probe_ent;
 }

drivers/ata/libata-sff.c

@@ -828,7 +828,6 @@ ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int
 
 	probe_ent->irq = pdev->irq;
 	probe_ent->irq_flags = IRQF_SHARED;
-	probe_ent->private_data = port[0]->private_data;
 
 	if (ports & ATA_PORT_PRIMARY) {
 		probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0);
@@ -878,7 +877,6 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
 		return NULL;
 
 	probe_ent->n_ports = 2;
-	probe_ent->private_data = port[0]->private_data;
 
 	if (port_mask & ATA_PORT_PRIMARY) {
 		probe_ent->irq = ATA_PRIMARY_IRQ;
@@ -908,6 +906,8 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
 				probe_ent->_host_flags |= ATA_HOST_SIMPLEX;
 		}
 		ata_std_ports(&probe_ent->port[1]);
+
+		/* FIXME: could be pointing to stack area; must copy */
 		probe_ent->pinfo2 = port[1];
 	} else
 		probe_ent->dummy_port_mask |= ATA_PORT_SECONDARY;