powerpc/85xx: minor fixes for MPC85xx DS board port

These issues were reported by Stephen Rothwell for another 85xx board
port and pointed out by Chen Gong as issues in the DS port.

* mpic OF node reference counting was off
* of_device_id struct should be marked as __initdata
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/platforms/85xx/mpc85xx_ds.c

@@ -58,14 +58,13 @@ void __init mpc85xx_ds_pic_init(void)
 {
 	struct mpic *mpic;
 	struct resource r;
-	struct device_node *np = NULL;
+	struct device_node *np;
 #ifdef CONFIG_PPC_I8259
 	struct device_node *cascade_node = NULL;
 	int cascade_irq;
 #endif
 
 	np = of_find_node_by_type(np, "open-pic");
-
 	if (np == NULL) {
 		printk(KERN_ERR "Could not find open-pic node\n");
 		return;
@@ -82,6 +81,7 @@ void __init mpc85xx_ds_pic_init(void)
 			  MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
 			0, 256, " OpenPIC  ");
 	BUG_ON(mpic == NULL);
+	of_node_put(np);
 
 	mpic_init(mpic);
 
@@ -185,7 +185,7 @@ static int __init mpc8544_ds_probe(void)
 	}
 }
 
-static struct of_device_id mpc85xxds_ids[] = {
+static struct of_device_id __initdata mpc85xxds_ids[] = {
 	{ .type = "soc", },
 	{ .compatible = "soc", },
 	{},