backlight: pm8941: Convert to using %pOFn instead of device_node.name

In preparation to remove the node name pointer from struct device_node,
convert printf users to use the %pOFn format specifier.

Cc: Lee Jones <lee.jones@linaro.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

drivers/video/backlight/pm8941-wled.c

@@ -330,7 +330,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
 
 	rc = of_property_read_string(dev->of_node, "label", &wled->name);
 	if (rc)
-		wled->name = dev->of_node->name;
+		wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
 
 	*cfg = pm8941_wled_config_defaults;
 	for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {