iio: humidity: am2315: Remove a stray unlock

We haven't taken the lock yet so we don't need to unlock here.

Fixes: 0d96d5ea ('iio: humidity: Add triggered buffer support for AM2315')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/humidity/am2315.c

@@ -165,10 +165,8 @@ static irqreturn_t am2315_trigger_handler(int irq, void *p)
 	struct am2315_sensor_data sensor_data;
 
 	ret = am2315_read_data(data, &sensor_data);
-	if (ret < 0) {
-		mutex_unlock(&data->lock);
+	if (ret < 0)
 		goto err;
-	}
 
 	mutex_lock(&data->lock);
 	if (*(indio_dev->active_scan_mask) == AM2315_ALL_CHANNEL_MASK) {