regulator: lp872x: Return -EINVAL if pdata is NULL

Return -EINVAL if pdata is NULL, otherwise we have NULL dereference bug.
This patch also moves the code checking pdata earlier in lp872x_probe.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/regulator/lp872x.c

@@ -785,11 +785,6 @@ static int lp872x_config(struct lp872x *lp)
 	struct lp872x_platform_data *pdata = lp->pdata;
 	int ret;
 
-	if (!pdata) {
-		dev_warn(lp->dev, "no platform data\n");
-		return 0;
-	}
-
 	if (!pdata->update_config)
 		return 0;
 
@@ -889,6 +884,11 @@ static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 		[LP8725] = LP8725_NUM_REGULATORS,
 	};
 
+	if (!pdata) {
+		dev_warn(&cl->dev, "no platform data\n");
+		return -EINVAL;
+	}
+
 	lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
 	if (!lp)
 		goto err_mem;