drm/tegra: sor: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
And using dev_err_probe() can reduce code size, the error value
gets printed.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/sor.c

@@ -2964,11 +2964,9 @@ static int tegra_sor_hdmi_probe(struct tegra_sor *sor)
 	int err;
 
 	sor->avdd_io_supply = devm_regulator_get(sor->dev, "avdd-io-hdmi-dp");
-	if (IS_ERR(sor->avdd_io_supply)) {
-		dev_err(sor->dev, "cannot get AVDD I/O supply: %ld\n",
-			PTR_ERR(sor->avdd_io_supply));
-		return PTR_ERR(sor->avdd_io_supply);
-	}
+	if (IS_ERR(sor->avdd_io_supply))
+		return dev_err_probe(sor->dev, PTR_ERR(sor->avdd_io_supply),
+				     "cannot get AVDD I/O supply\n");
 
 	err = tegra_sor_enable_regulator(sor, sor->avdd_io_supply);
 	if (err < 0) {
@@ -2978,11 +2976,9 @@ static int tegra_sor_hdmi_probe(struct tegra_sor *sor)
 	}
 
 	sor->vdd_pll_supply = devm_regulator_get(sor->dev, "vdd-hdmi-dp-pll");
-	if (IS_ERR(sor->vdd_pll_supply)) {
-		dev_err(sor->dev, "cannot get VDD PLL supply: %ld\n",
-			PTR_ERR(sor->vdd_pll_supply));
-		return PTR_ERR(sor->vdd_pll_supply);
-	}
+	if (IS_ERR(sor->vdd_pll_supply))
+		return dev_err_probe(sor->dev, PTR_ERR(sor->vdd_pll_supply),
+				     "cannot get VDD PLL supply\n");
 
 	err = tegra_sor_enable_regulator(sor, sor->vdd_pll_supply);
 	if (err < 0) {
@@ -2992,11 +2988,9 @@ static int tegra_sor_hdmi_probe(struct tegra_sor *sor)
 	}
 
 	sor->hdmi_supply = devm_regulator_get(sor->dev, "hdmi");
-	if (IS_ERR(sor->hdmi_supply)) {
-		dev_err(sor->dev, "cannot get HDMI supply: %ld\n",
-			PTR_ERR(sor->hdmi_supply));
-		return PTR_ERR(sor->hdmi_supply);
-	}
+	if (IS_ERR(sor->hdmi_supply))
+		return dev_err_probe(sor->dev, PTR_ERR(sor->hdmi_supply),
+				     "cannot get HDMI supply\n");
 
 	err = tegra_sor_enable_regulator(sor, sor->hdmi_supply);
 	if (err < 0) {