avcodec/bmvaudio: Mark decoder as init-threadsafe

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

libavcodec/bmvaudio.c

@@ -86,4 +86,5 @@ const AVCodec ff_bmv_audio_decoder = {
     .init           = bmv_aud_decode_init,
     .decode         = bmv_aud_decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
 };