[glib] Add annotation for g_variant_get_string

[Tomeu Vizoso <tomeuv src gnome org>]

commit 38a3b1730de7ec40627c2f6f75320e9e432ce12c
Author: Tomeu Vizoso <tomeu vizoso collabora co uk>
Date:   Sat Sep 11 17:01:10 2010 +0200

    Add annotation for g_variant_get_string

 glib/gvariant.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glib/gvariant.c b/glib/gvariant.c
index 6822a2a..bbfa95c 100644
--- a/glib/gvariant.c
+++ b/glib/gvariant.c
@@ -1081,7 +1081,7 @@ g_variant_is_signature (const gchar *string)
 /**
  * g_variant_get_string:
  * @value: a string #GVariant instance
- * @length: (allow-none) (default NULL): a pointer to a #gsize,
+ * @length: (allow-none) (default NULL) (out): a pointer to a #gsize,
  *          to store the length
  * @returns: the constant string, utf8 encoded
  *