[totem/wip/hadess/subtitle-labels-fixes] backend: Better documentation for BvwLangInfo

[Bastien Nocera <hadess src gnome org>]

commit 6110d8d25bb14c112cac797e9094966de40ba8cf
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Feb 18 18:01:44 2019 +0100

    backend: Better documentation for BvwLangInfo

 src/backend/bacon-video-widget.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/backend/bacon-video-widget.h b/src/backend/bacon-video-widget.h
index 1f85ec6d7..676933f8f 100644
--- a/src/backend/bacon-video-widget.h
+++ b/src/backend/bacon-video-widget.h
@@ -385,7 +385,8 @@ void bacon_video_widget_dvd_event                (BaconVideoWidget *bvw,
 /**
  * BvwLangInfo:
  * @language: the ISO-639 language code for the track, or "und" if unknown.
- * @codec: the codec for the track
+ * Can never be %NULL.
+ * @codec: the codec for the track, or %NULL if unknown or unset.
  *
  * #BvwLangInfo holds the language code and codec for each subtitle
  * or audio track for a media, which would allow the front-ends to