memleak fix by (Jake Page <jake at CS dot Stanford dot EDU>)

with minor fix by me


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@2014 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/mpegvideo.c

@@ -476,6 +476,9 @@ void MPV_common_end(MpegEncContext *s)
 {
     int i;
 
+    av_freep(&s->parse_context.buffer);
+    s->parse_context.buffer_size=0;
+
     av_freep(&s->mb_type);
     av_freep(&s->p_mv_table_base);
     av_freep(&s->b_forw_mv_table_base);