Simplify using the devm_regulator_get_enable_optional(). Also drop the
now unused struct member 'hdmi_supply'.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Martin Blumenstingl [off-list ref]
---
v4 resend 2:
Respinning unchanged code with the commit title changed as wa suggested
by Robert Foss and commit message changed as was suggested by Martin.

I am doing a clean-up for my local git and encountered this one.
Respinning as it seems this one fell through the cracks.
---
  drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
  1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 5cd2b2ebbbd3..7642f740272b 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c

@@ -140,7 +140,6 @@ struct meson_dw_hdmi {
  	struct reset_control *hdmitx_apb;
  	struct reset_control *hdmitx_ctrl;
  	struct reset_control *hdmitx_phy;
-	struct regulator *hdmi_supply;
  	u32 irq_stat;
  	struct dw_hdmi *hdmi;
  	struct drm_bridge *bridge;

@@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
  
  }
  
-static void meson_disable_regulator(void *data)
-{
-	regulator_disable(data);
-}
-
  static void meson_disable_clk(void *data)
  {
  	clk_disable_unprepare(data);

@@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
  	meson_dw_hdmi->data = match;
  	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
  
-	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
-	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
-		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		meson_dw_hdmi->hdmi_supply = NULL;
-	} else {
-		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
-		if (ret)
-			return ret;
-		ret = devm_add_action_or_reset(dev, meson_disable_regulator,
-					       meson_dw_hdmi->hdmi_supply);
-		if (ret)
-			return ret;
-	}
+	ret = devm_regulator_get_enable_optional(dev, "hdmi");
+	if (ret != -ENODEV)