[mutter/gnome-3-18] Shut up some compiler warnings

[Florian Müllner <fmuellner src gnome org>]

commit 8a529123be092335d676ab9b6ae7975af0621e08
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jan 21 17:10:01 2016 +0100

    Shut up some compiler warnings

 src/wayland/meta-wayland-data-device.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/wayland/meta-wayland-data-device.c b/src/wayland/meta-wayland-data-device.c
index 3d60690..6e15c94 100644
--- a/src/wayland/meta-wayland-data-device.c
+++ b/src/wayland/meta-wayland-data-device.c
@@ -112,7 +112,7 @@ struct wl_array *
 meta_wayland_data_source_get_mime_types (const MetaWaylandDataSource *source)
 {
   MetaWaylandDataSourcePrivate *priv =
-    meta_wayland_data_source_get_instance_private (source);
+    meta_wayland_data_source_get_instance_private ((MetaWaylandDataSource *)source);
 
   return &priv->mime_types;
 }
@@ -966,7 +966,7 @@ meta_wayland_data_source_has_mime_type (const MetaWaylandDataSource *source,
                                         const gchar                 *mime_type)
 {
   MetaWaylandDataSourcePrivate *priv =
-    meta_wayland_data_source_get_instance_private (source);
+    meta_wayland_data_source_get_instance_private ((MetaWaylandDataSource *)source);
   gchar **p;
 
   wl_array_for_each (p, &priv->mime_types)