Staging: iio: --/++ confusion in build_channel_array() error cleanup

Fix loop: it should decrement
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Acked-by: NJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/Documentation/iio_utils.h

@@ -398,7 +398,7 @@ inline int build_channel_array(const char *device_dir,
 	return 0;
 
 error_cleanup_array:
-	for (i = count - 1;  i >= 0; i++)
+	for (i = count - 1;  i >= 0; i--)
 		free((*ci_array)[i].name);
 	free(*ci_array);
 error_close_dir: