ucc_geth: Don't use RX clock as TX clock.

Commit 9fb1e350,
ucc_geth: use rx-clock-name and tx-clock-name device tree properties
Introduced a typo that made the driver use the RX clock
as TX clock, causing massive TX errors.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/ucc_geth.c

@@ -3922,7 +3922,7 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
 			return -EINVAL;
 		}
 	} else {
-		prop = of_get_property(np, "rx-clock", NULL);
+		prop = of_get_property(np, "tx-clock", NULL);
 		if (!prop) {
 			printk(KERN_ERR
 				"ucc_geth: mising tx-clock-name property\n");