powerpc/powermac: Use for_each_property_of_node()

Replace open-coded for loop with for_each_property_of_node().
Reported-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/powermac/pfunc_core.c

@@ -685,7 +685,7 @@ static int pmf_add_functions(struct pmf_device *dev, void *driverdata)
 	const int plen = strlen(PP_PREFIX);
 	int count = 0;
 
-	for (pp = dev->node->properties; pp != 0; pp = pp->next) {
+	for_each_property_of_node(dev->node, pp) {
 		const char *name;
 		if (strncmp(pp->name, PP_PREFIX, plen) != 0)
 			continue;