demux: remove unused demux_meta_t.p_demux

include/vlc_demux.h

@@ -91,7 +91,6 @@ struct demux_t
 typedef struct demux_meta_t
 {
     VLC_COMMON_MEMBERS
-    demux_t *p_demux; /** FIXME: use stream_t instead? */
     input_item_t *p_item; /***< the input item that is being read */
 
     vlc_meta_t *p_meta;                 /**< meta data */

src/input/input.c

@@ -2489,10 +2489,9 @@ static void InputSourceMeta( input_thread_t *p_input,
         return;
 
     demux_meta_t *p_demux_meta =
-        vlc_custom_create( p_demux, sizeof( *p_demux_meta ), "demux meta" );
-    if( !p_demux_meta )
+        vlc_custom_create( p_input, sizeof( *p_demux_meta ), "demux meta" );
+    if( unlikely(p_demux_meta == NULL) )
         return;
-    p_demux_meta->p_demux = p_demux;
     p_demux_meta->p_item = p_input->p->p_item;
 
     module_t *p_id3 = module_need( p_demux_meta, "meta reader", NULL, false );