regulator: wm831x-ldo: Remove redundant error message

kzalloc prints its own OOM message upon failure.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/wm831x-ldo.c

@@ -235,10 +235,8 @@ static int wm831x_gp_ldo_probe(struct platform_device *pdev)
 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 
 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
-	if (ldo == NULL) {
-		dev_err(&pdev->dev, "Unable to allocate private data\n");
+	if (!ldo)
 		return -ENOMEM;
-	}
 
 	ldo->wm831x = wm831x;
 
@@ -447,10 +445,8 @@ static int wm831x_aldo_probe(struct platform_device *pdev)
 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 
 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
-	if (ldo == NULL) {
-		dev_err(&pdev->dev, "Unable to allocate private data\n");
+	if (!ldo)
 		return -ENOMEM;
-	}
 
 	ldo->wm831x = wm831x;
 
@@ -594,10 +590,8 @@ static int wm831x_alive_ldo_probe(struct platform_device *pdev)
 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 
 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
-	if (ldo == NULL) {
-		dev_err(&pdev->dev, "Unable to allocate private data\n");
+	if (!ldo)
 		return -ENOMEM;
-	}
 
 	ldo->wm831x = wm831x;