avformat/stldec: Simplify cleanup after read_header failure

by setting the FF_FMT_INIT_CLEANUP flag.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/stldec.c

@@ -97,10 +97,8 @@ static int stl_read_header(AVFormatContext *s)
         if (pts_start != AV_NOPTS_VALUE) {
             AVPacket *sub;
             sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
-            if (!sub) {
-                ff_subtitles_queue_clean(&stl->q);
+            if (!sub)
                 return AVERROR(ENOMEM);
-            }
             sub->pos = pos;
             sub->pts = pts_start;
             sub->duration = duration;
@@ -134,6 +132,7 @@ const AVInputFormat ff_stl_demuxer = {
     .name           = "stl",
     .long_name      = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
     .priv_data_size = sizeof(STLContext),
+    .flags_internal = FF_FMT_INIT_CLEANUP,
     .read_probe     = stl_probe,
     .read_header    = stl_read_header,
     .read_packet    = stl_read_packet,