avcodec/opusdec: Mark decoder as init-threadsafe

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/opusdec.c

@@ -716,5 +716,5 @@ AVCodec ff_opus_decoder = {
     .decode          = opus_decode_packet,
     .flush           = opus_decode_flush,
     .capabilities    = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
-    .caps_internal   = FF_CODEC_CAP_INIT_CLEANUP,
+    .caps_internal   = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };