[rygel/rygel-0-22] renderer: Check instance id of prev/next

[Jens Georg <jensgeorg src gnome org>]

commit efc9a74d6bb9fa66ad4f65e83a4e8148383b2c09
Author: Jens Georg <mail jensge org>
Date:   Sat Jun 28 11:53:43 2014 +0200

    renderer: Check instance id of prev/next
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/librygel-renderer/rygel-av-transport.vala |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/librygel-renderer/rygel-av-transport.vala b/src/librygel-renderer/rygel-av-transport.vala
index 361df7e..47a1a12 100644
--- a/src/librygel-renderer/rygel-av-transport.vala
+++ b/src/librygel-renderer/rygel-av-transport.vala
@@ -581,6 +581,10 @@ internal class Rygel.AVTransport : Service {
     }
 
     private void next_cb (Service service, ServiceAction action) {
+        if (!this.check_instance_id (action)) {
+            return;
+        }
+
         if (this.controller.next ()) {
             action.return ();
         } else {
@@ -589,6 +593,10 @@ internal class Rygel.AVTransport : Service {
     }
 
     private void previous_cb (Service service, ServiceAction action) {
+        if (!this.check_instance_id (action)) {
+            return;
+        }
+
         if (this.controller.previous ()) {
             action.return ();
         } else {