renderer: make p_sys a void pointer

include/vlc_renderer_discovery.h

@@ -114,7 +114,6 @@ vlc_renderer_item_flags(const vlc_renderer_item_t *p_item);
  * @{
  */
 
-typedef struct vlc_renderer_discovery_sys vlc_renderer_discovery_sys;
 struct vlc_renderer_discovery_owner;
 
 /**
@@ -172,7 +171,7 @@ struct vlc_renderer_discovery_t
     char *              psz_name;
     config_chain_t *    p_cfg;
 
-    vlc_renderer_discovery_sys *p_sys;
+    void *p_sys;
 };
 
 /**

modules/services_discovery/upnp.cpp

@@ -1609,7 +1609,7 @@ static int OpenRD( vlc_object_t *p_this )
 
     if ( !p_sys )
         return VLC_ENOMEM;
-    p_rd->p_sys = ( vlc_renderer_discovery_sys* ) p_sys;
+    p_rd->p_sys = p_sys;
     p_sys->p_upnp = UpnpInstanceWrapper::get( p_this );
 
     if ( !p_sys->p_upnp )