powerpc: 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: Michael Ellerman <michael@ellerman.id.au>

arch/powerpc/include/asm/parport.h

@@ -21,9 +21,7 @@ static int parport_pc_find_nonpci_ports (int autoirq, int autodma)
 	int count = 0;
 	int virq;
 
-	for (np = NULL; (np = of_find_compatible_node(np,
-						      "parallel",
-						      "pnpPNP,400")) != NULL;) {
+	for_each_compatible_node(np, "parallel", "pnpPNP,400") {
 		prop = of_get_property(np, "reg", &propsize);
 		if (!prop || propsize > 6*sizeof(u32))
 			continue;