iio: consumer.h: Fix scale factor in function comment

1 milivolt is equal to 1000000 nanovolts.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index 6f64624..26fb8f6 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -201,7 +201,7 @@
  * The scale factor allows to increase the precession of the returned value. For
  * a scale factor of 1 the function will return the result in the normal IIO
  * unit for the channel type. E.g. millivolt for voltage channels, if you want
- * nanovolts instead pass 1000 as the scale factor.
+ * nanovolts instead pass 1000000 as the scale factor.
  */
 int iio_convert_raw_to_processed(struct iio_channel *chan, int raw,
 	int *processed, unsigned int scale);