yadif: reject reuse2 buffers as we cant use frames that change under our

fingers.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_yadif.c

@@ -405,7 +405,8 @@ AVFilter avfilter_vf_yadif = {
                                     .start_frame      = start_frame,
                                     .get_video_buffer = get_video_buffer,
                                     .draw_slice       = null_draw_slice,
-                                    .end_frame        = end_frame, },
+                                    .end_frame        = end_frame,
+                                    .rej_perms        = AV_PERM_REUSE2, },
                                   { .name = NULL}},
 
     .outputs   = (const AVFilterPad[]) {{ .name       = "default",