avcodec/dvdsubdec: free subtitle rectangles if nothing is output

Fixes assertion failure
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1 insertions, 0 deletions

diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 39b0e25a13..2b363d02d9 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -540,6 +540,7 @@ static int dvdsub_decode(AVCodecContext *avctx,
 
     if (is_menu < 0) {
     no_subtitle:
+        reset_rects(sub);
         *data_size = 0;
 
         return buf_size;