Attach the sap object to libvlc.

(cherry picked from commit 479dc6f7)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

src/stream_output/sap.c

@@ -108,6 +108,7 @@ sap_handler_t *SAP_Create (vlc_object_t *p_announce)
     if (p_sap == NULL)
         return NULL;
 
+    vlc_object_attach( p_sap, p_announce );
     vlc_mutex_init (&p_sap->lock);
     p_sap->first = NULL;
     return p_sap;