regulator: remove unnecessary of_node_get() to parent

These of_node_get() were added to balance refcount decrements inside of
of_find_node_by_name().
See: commit c92f5dd2c42f ("regulator: Add missing of_node_put()")

However of_find_node_by_name() was then replaced by of_get_child_by_name(),
which doesn't call of_node_put() against its input parameter.

So, need to remove these unnecessary of_node_get() calls.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 90b4c53..9c31e21 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -917,7 +917,7 @@
 	struct max8997_regulator_data *rdata;
 	unsigned int i, dvs_voltage_nr = 1, ret;
 
-	pmic_np = of_node_get(iodev->dev->of_node);
+	pmic_np = iodev->dev->of_node;
 	if (!pmic_np) {
 		dev_err(&pdev->dev, "could not find pmic sub-node\n");
 		return -ENODEV;