iio: 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: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-iio@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/qcom-pm8xxx-xoadc.c

@@ -708,8 +708,8 @@ static int pm8xxx_of_xlate(struct iio_dev *indio_dev,
 	 * mux.
 	 */
 	if (iiospec->args_count != 2) {
-		dev_err(&indio_dev->dev, "wrong number of arguments for %s need 2 got %d\n",
-			iiospec->np->name,
+		dev_err(&indio_dev->dev, "wrong number of arguments for %pOFn need 2 got %d\n",
+			iiospec->np,
 			iiospec->args_count);
 		return -EINVAL;
 	}

drivers/iio/adc/rcar-gyroadc.c

@@ -343,8 +343,8 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 	for_each_child_of_node(np, child) {
 		of_id = of_match_node(rcar_gyroadc_child_match, child);
 		if (!of_id) {
-			dev_err(dev, "Ignoring unsupported ADC \"%s\".",
-				child->name);
+			dev_err(dev, "Ignoring unsupported ADC \"%pOFn\".",
+				child);
 			continue;
 		}
 
@@ -381,16 +381,16 @@ static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 			ret = of_property_read_u32(child, "reg", &reg);
 			if (ret) {
 				dev_err(dev,
-					"Failed to get child reg property of ADC \"%s\".\n",
-					child->name);
+					"Failed to get child reg property of ADC \"%pOFn\".\n",
+					child);
 				return ret;
 			}
 
 			/* Channel number is too high. */
 			if (reg >= num_channels) {
 				dev_err(dev,
-					"Only %i channels supported with %s, but reg = <%i>.\n",
-					num_channels, child->name, reg);
+					"Only %i channels supported with %pOFn, but reg = <%i>.\n",
+					num_channels, child, reg);
 				return ret;
 			}
 		}

drivers/iio/frequency/adf4350.c

@@ -388,7 +388,7 @@ static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
 	if (!pdata)
 		return NULL;
 
-	strncpy(&pdata->name[0], np->name, SPI_NAME_SIZE - 1);
+	snprintf(&pdata->name[0], SPI_NAME_SIZE - 1, "%pOFn", np);
 
 	tmp = 10000;
 	of_property_read_u32(np, "adi,channel-spacing", &tmp);