[rygel] core: Fix use of OCM flag

[Jens Georg <jensgeorg src gnome org>]

commit 39ffc6c21e2a773a60b6c07fd61e412614bbdb05
Author: Jens Georg <mail jensge org>
Date:   Tue Nov 18 17:10:45 2014 +0100

    core: Fix use of OCM flag
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/librygel-core/rygel-description-file.vala |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/src/librygel-core/rygel-description-file.vala b/src/librygel-core/rygel-description-file.vala
index e54e293..26c1407 100644
--- a/src/librygel-core/rygel-description-file.vala
+++ b/src/librygel-core/rygel-description-file.vala
@@ -222,23 +222,28 @@ public class Rygel.DescriptionFile : Object {
             } catch (GLib.Error error) { }
 
             if (allow_upload) {
+                bool can_upload = false;
                 if (PluginCapabilities.IMAGE_UPLOAD in capabilities) {
                     flags += "image-upload";
+                    can_upload = true;
                 }
 
                 if (PluginCapabilities.VIDEO_UPLOAD in capabilities) {
                     flags += "av-upload";
+                    can_upload = true;
                 }
 
                 if (PluginCapabilities.AUDIO_UPLOAD in capabilities) {
                     flags += "audio-upload";
+                    can_upload = true;
                 }
-            }
 
-            if (allow_delete) {
-                flags += "create-item-with-OCM-destroy-item";
+                // destroy capablity needs to co-exist with at least one
+                // of the upload caps. DLNA 2014, 7.4.1.8.4.1, Table 26
+                if (allow_delete && can_upload) {
+                    flags += "create-item-with-OCM-destroy-item";
+                }
             }
-
         }
 
         if (PluginCapabilities.TRACK_CHANGES in capabilities) {