powerpc/82xx: Use for_each_compatible_node() macro

Use for_each_compatible_node() macro instead of open coding it.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/82xx/pq2.c

@@ -71,11 +71,11 @@ err:
 
 void __init pq2_init_pci(void)
 {
-	struct device_node *np = NULL;
+	struct device_node *np;
 
 	ppc_md.pci_exclude_device = pq2_pci_exclude_device;
 
-	while ((np = of_find_compatible_node(np, NULL, "fsl,pq2-pci")))
+	for_each_compatible_node(np, NULL, "fsl,pq2-pci")
 		pq2_pci_add_bridge(np);
 }
 #endif