avformat/segafilm: drop song and dance, this seems not to do anything anymore since a long time

Fixes use of uninitialized memory
Partly fixes; msan_uninit-mem_7fb7d24780d0_2744_R03T.CAK
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/segafilm.c

@@ -266,18 +266,10 @@ static int film_read_packet(AVFormatContext *s,
     /* position the stream (will probably be there anyway) */
     avio_seek(pb, sample->sample_offset, SEEK_SET);
 
-    /* do a special song and dance when loading FILM Cinepak chunks */
-    if ((sample->stream == film->video_stream_index) &&
-        (film->video_type == AV_CODEC_ID_CINEPAK)) {
-        pkt->pos= avio_tell(pb);
-        if (av_new_packet(pkt, sample->sample_size))
-            return AVERROR(ENOMEM);
-        avio_read(pb, pkt->data, sample->sample_size);
-    } else {
+
     ret= av_get_packet(pb, pkt, sample->sample_size);
     if (ret != sample->sample_size)
         ret = AVERROR(EIO);
-    }
 
     pkt->stream_index = sample->stream;
     pkt->pts = sample->pts;