stream_filter: rar: reject if rar is compressed

(cherry picked from commit 8840af091352a619d12ddfa1f15f509f19b7699a)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/access/rar/stream.c

@@ -72,8 +72,8 @@ int RarStreamOpen(vlc_object_t *object)
     int count;
     rar_file_t **files;
     const int64_t position = stream_Tell(s->p_source);
-    if (RarParse(s->p_source, &count, &files, false) &&
-        RarParse(s->p_source, &count, &files, true ) )
+    if ((RarParse(s->p_source, &count, &files, false) &&
+         RarParse(s->p_source, &count, &files, true )) || count == 0 )
     {
         stream_Seek(s->p_source, position);
         msg_Err(s, "Invalid or unsupported RAR archive");