[glib] g_uri_escape_string: Add missing allow-none annotation

[Vadim Rutkovsky <vrutkovsky src gnome org>]

commit 8d29a5a357425892e0fa7e2bc79b7f8b23c7ebd0
Author: Arnel A. Borja <kyoushuu yahoo com>
Date:   Sat Jun 1 14:47:27 2013 +0800

    g_uri_escape_string: Add missing allow-none annotation
    
    https://bugzilla.gnome.org/show_bug.cgi?id=701409

 glib/gurifuncs.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glib/gurifuncs.c b/glib/gurifuncs.c
index d438205..5a4a719 100644
--- a/glib/gurifuncs.c
+++ b/glib/gurifuncs.c
@@ -217,8 +217,8 @@ g_uri_parse_scheme (const char  *uri)
 /**
  * g_uri_escape_string:
  * @unescaped: the unescaped input string.
- * @reserved_chars_allowed: a string of reserved characters that are
- *      allowed to be used, or %NULL.
+ * @reserved_chars_allowed: (allow-none): a string of reserved characters that
+ *      are allowed to be used, or %NULL.
  * @allow_utf8: %TRUE if the result can include UTF-8 characters.
  * 
  * Escapes a string for use in a URI.