[POWERPC] Remove old interface find_devices

Replace uses with of_find_node_by_name and for_each_node_by_name.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index 2b163c5..cd92a39 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -1467,7 +1467,8 @@
 	if (ZS_IS_IRDA(uap))
 		uap->port_type = PMAC_SCC_IRDA;
 	if (ZS_IS_INTMODEM(uap)) {
-		struct device_node* i2c_modem = find_devices("i2c-modem");
+		struct device_node* i2c_modem =
+			of_find_node_by_name(NULL, "i2c-modem");
 		if (i2c_modem) {
 			const char* mid =
 				of_get_property(i2c_modem, "modem-id", NULL);
@@ -1482,6 +1483,7 @@
 			}
 			printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
 				mid ? (*mid) : 0);
+			of_node_put(i2c_modem);
 		} else {
 			printk(KERN_INFO "pmac_zilog: serial modem detected\n");
 		}