ass subtitles: Fix valgrind warnings.

We're now running some of this code through valgrind for the first
time, and a few warnings showed up stemming from two problems.

1) The ASS code assumes the subtitle header is null terminated, but
it wasn't, and passing the size down doesn't look like fun, so I
added a terminator

2) The code wasn't freeing all of its state.

Signed-off-by: Philip Langdale <philipl@overt.org>

ffmpeg.c

@@ -3366,7 +3366,8 @@ static int transcode_init(void)
             if ((ist = get_input_stream(ost)))
                 dec = ist->st->codec;
             if (dec && dec->subtitle_header) {
-                ost->st->codec->subtitle_header = av_malloc(dec->subtitle_header_size);
+                /* ASS code assumes this buffer is null terminated so add extra byte. */
+                ost->st->codec->subtitle_header = av_mallocz(dec->subtitle_header_size + 1);
                 if (!ost->st->codec->subtitle_header) {
                     ret = AVERROR(ENOMEM);
                     goto dump_format;

libavcodec/ass_split.c

@@ -352,8 +352,10 @@ void ff_ass_split_free(ASSSplitContext *ctx)
 {
     if (ctx) {
         int i;
-        for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
+        for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++) {
             free_section(ctx, &ass_sections[i]);
+            av_freep(&(ctx->field_order[i]));
+        }
         av_free(ctx);
     }
 }