include/linux/of.h: make for_each_child_of_node() reference its args when CONFIG_OF=n

Make for_each_child_of_node() reference its args when CONFIG_OF=n to
avoid warnings like:

drivers/leds/leds-pwm.c:88:22: warning: unused variable 'node' [-Wunused-variable]
struct device_node *node = pdev->dev.of_node;
^

Signed-off-by: David Howells <[e-mail]>
Cc: Grant Likely <[e-mail]>
Cc: Rob Herring <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/of.h

···
 	return false;
 }
 
+/* Kill an unused variable warning on a device_node pointer */
+static inline void __of_use_dn(const struct device_node *np)
+{
+}
+
 #define for_each_child_of_node(parent, child) \
-	while (0)
+	while (__of_use_dn(parent), __of_use_dn(child), 0)
 
 #define for_each_available_child_of_node(parent, child) \
 	while (0)