[gstreamermm] Query: Correct the docs usage example so that its lines compile.

[Josà Alburquerque <jaalburqu src gnome org>]

commit a6933d2012fbe626eb110320ab6c4338c583e7bc
Author: Josà Alburquerque <jaalburqu svn gnome org>
Date:   Fri Sep 7 07:26:45 2012 -0400

    Query: Correct the docs usage example so that its lines compile.
    
    	* gstreamer/src/query.hg: The example was not translated correctly
    	from the C code thus lines from the example would not compile
    	correctly.  The error was discovered on the GStreamer mailing list.

 ChangeLog              |    8 ++++++++
 gstreamer/src/query.hg |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index a739ecc..4ecac22 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2012-09-07  Josà Alburquerque  <jaalburquerque gmail com>
+
+	Query: Correct the docs usage example so that its lines compile.
+
+	* gstreamer/src/query.hg: The example was not translated correctly
+	from the C code thus lines from the example would not compile
+	correctly.  The error was discovered on the GStreamer mailing list.
+
 2012-08-15  Josà Alburquerque  <jaalburquerque gmail com>
 
 	Examples: Fix the media player example for MinGW.
diff --git a/gstreamer/src/query.hg b/gstreamer/src/query.hg
index e9df36a..6be1806 100644
--- a/gstreamer/src/query.hg
+++ b/gstreamer/src/query.hg
@@ -103,7 +103,7 @@ _IGNORE(gst_query_type_to_quark)
  * bool res = pipeline->query(query);
  * if(res)
  * {
- *  gint64 duration = query.parse();
+ *  gint64 duration = Glib::RefPtr<Gst::QueryDuration>::cast_dynamic(query)->parse();
  *  ...
  * }
  * @endcode