dt/s3c64xx/spi: Use of_get_child_by_name to get a named child

As follow-up to "dt: introduce of_get_child_by_name to get child node by
name." patch, This patch removes some of the code duplication in the
driver by replacing it with of_get_child_by_name instead.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>

drivers/spi/spi-s3c64xx.c

@@ -835,9 +835,7 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 		return ERR_PTR(-EINVAL);
 	}
 
-	for_each_child_of_node(slave_np, data_np)
-		if (!strcmp(data_np->name, "controller-data"))
-			break;
+	data_np = of_get_child_by_name(slave_np, "controller-data");
 	if (!data_np) {
 		dev_err(&spi->dev, "child node 'controller-data' not found\n");
 		return ERR_PTR(-EINVAL);
@@ -847,6 +845,7 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 	if (!cs) {
 		dev_err(&spi->dev, "could not allocate memory for controller"
 					" data\n");
+		of_node_put(data_np);
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -855,11 +854,13 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
 		dev_err(&spi->dev, "chip select gpio is not specified or "
 					"invalid\n");
 		kfree(cs);
+		of_node_put(data_np);
 		return ERR_PTR(-EINVAL);
 	}
 
 	of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
 	cs->fb_delay = fb_delay;
+	of_node_put(data_np);
 	return cs;
 }