[vala] gstreamer-1.0: Mark *.make_writable with "ReturnsModifiedPointer"

[Rico Tzschichholz <ricotz src gnome org>]

commit c4f2d4878463e5615dcc5186380b711755556053
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Mar 8 10:31:33 2017 +0100

    gstreamer-1.0: Mark *.make_writable with "ReturnsModifiedPointer"
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759255

 vapi/gstreamer-1.0.vapi             |    2 ++
 vapi/gstreamer-video-1.0.vapi       |    1 +
 vapi/metadata/Gst-1.0.metadata      |    1 +
 vapi/metadata/GstVideo-1.0.metadata |    1 +
 4 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/vapi/gstreamer-1.0.vapi b/vapi/gstreamer-1.0.vapi
index 1cd3542..c321f93 100644
--- a/vapi/gstreamer-1.0.vapi
+++ b/vapi/gstreamer-1.0.vapi
@@ -1682,6 +1682,7 @@ namespace Gst {
                public T get_qdata<T> (GLib.Quark quark);
                public bool is_writable ();
                public bool @lock (Gst.LockFlags flags);
+               [ReturnsModifiedPointer]
                public Gst.MiniObject make_writable ();
                public unowned Gst.MiniObject @ref ();
                public static bool replace (ref Gst.MiniObject? olddata, Gst.MiniObject? newdata);
@@ -2519,6 +2520,7 @@ namespace Gst {
                public bool is_writable ();
                [Version (since = "1.6")]
                public Gst.Uri join (Gst.Uri? ref_uri);
+               [ReturnsModifiedPointer]
                [Version (since = "1.6")]
                public Gst.Uri make_writable ();
                [Version (since = "1.6")]
diff --git a/vapi/gstreamer-video-1.0.vapi b/vapi/gstreamer-video-1.0.vapi
index 12ff1c9..d5b4b1f 100644
--- a/vapi/gstreamer-video-1.0.vapi
+++ b/vapi/gstreamer-video-1.0.vapi
@@ -296,6 +296,7 @@ namespace Gst {
                        public Gst.Video.OverlayComposition copy ();
                        public unowned Gst.Video.OverlayRectangle get_rectangle (uint n);
                        public uint get_seqnum ();
+                       [ReturnsModifiedPointer]
                        public Gst.Video.OverlayComposition make_writable ();
                        public uint n_rectangles ();
                }
diff --git a/vapi/metadata/Gst-1.0.metadata b/vapi/metadata/Gst-1.0.metadata
index e2f64af..eb4c47c 100644
--- a/vapi/metadata/Gst-1.0.metadata
+++ b/vapi/metadata/Gst-1.0.metadata
@@ -199,6 +199,7 @@ TagList base_type="Gst.MiniObject"
   .mini_object skip
 Toc base_type="Gst.MiniObject"
 TocEntry base_type="Gst.MiniObject"
+*.make_writable returns_modified_pointer
 
 // Reparenting
 TAG_* parent="Gst.Tags" name="TAG_(.+)"
diff --git a/vapi/metadata/GstVideo-1.0.metadata b/vapi/metadata/GstVideo-1.0.metadata
index b115e0e..1777e7a 100644
--- a/vapi/metadata/GstVideo-1.0.metadata
+++ b/vapi/metadata/GstVideo-1.0.metadata
@@ -19,6 +19,7 @@ VideoCodecFrame
 // Gst.MiniObject inheritance
 VideoOverlayComposition base_type="Gst.MiniObject"
 VideoOverlayRectangle base_type="Gst.MiniObject"
+*.make_writable returns_modified_pointer
 
 // Bug #685833
 VideoCodecFrame