demux: asf: add fake root guid for debugging

modules/demux/asf/libasf.c

@@ -1517,6 +1517,7 @@ static const struct
     const char *psz_name;
 } ASF_ObjectDumpDebugInfo[] =
 {
+    { &vlc_object_root_guid, "Root" },
     { &asf_object_header_guid, "Header" },
     { &asf_object_data_guid, "Data" },
     { &asf_object_index_guid, "Index" },
@@ -1607,7 +1608,7 @@ asf_object_root_t *ASF_ReadObjectRoot( stream_t *s, int b_seekable )
         return NULL;
 
     p_root->i_type = ASF_OBJECT_ROOT;
-    memcpy( &p_root->i_object_id, &asf_object_null_guid, sizeof( guid_t ) );
+    memcpy( &p_root->i_object_id, &vlc_object_root_guid, sizeof( guid_t ) );
     p_root->i_object_pos = stream_Tell( s );
     p_root->i_object_size = 0;
     p_root->p_first = NULL;

modules/demux/asf/libasf_guid.h

@@ -62,6 +62,14 @@ static const guid_t asf_object_null_guid =
     { 0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00 }
 };
 
+static const guid_t vlc_object_root_guid =
+{
+    0x00000000,
+    0x0000,
+    0x0000,
+    { 0x56, 0x4C, 0x43, 0x52, 0x4F, 0x4F, 0x54, 0x00 }
+};
+
 /* Top-Level object */
 static const guid_t asf_object_header_guid =
 {0x75B22630, 0x668E, 0x11CF, {0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C}};