hwmon: (sht15) fix bad error code

When no platform data was supplied, returned error code was 0.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Cc: stable@vger.kernel.org # 2.6.32+
Signed-off-by: NGuenter Roeck <guenter.roeck@ericsson.com>

drivers/hwmon/sht15.c

@@ -883,7 +883,7 @@ static int sht15_invalidate_voltage(struct notifier_block *nb,
 
 static int __devinit sht15_probe(struct platform_device *pdev)
 {
-	int ret = 0;
+	int ret;
 	struct sht15_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
 	u8 status = 0;
 
@@ -901,6 +901,7 @@ static int __devinit sht15_probe(struct platform_device *pdev)
 	init_waitqueue_head(&data->wait_queue);
 
 	if (pdev->dev.platform_data == NULL) {
+		ret = -EINVAL;
 		dev_err(&pdev->dev, "no platform data supplied\n");
 		goto err_free_data;
 	}