staging:iio:ade7758: Fix check if channels are enabled in prenable

We should check if a channel is enabled, not if no channels are enabled.

Fixes: 550268ca ("staging:iio: scrap scan_count and ensure all drivers use active_scan_mask")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

(cherry picked from commit 79fa64eb)
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

drivers/staging/iio/meter/ade7758_ring.c

@@ -93,7 +93,7 @@ static int ade7758_ring_preenable(struct iio_dev *indio_dev)
 	unsigned channel;
 	int ret;
 
-	if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
+	if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
 		return -EINVAL;
 
 	ret = iio_sw_buffer_preenable(indio_dev);