[PATCH] Revise check for codec id in voc demuxer.

[Justin Ruggles]

This fixes demuxing of packets that do not contain a codec tag and come before the codec_id has been set.
---
 libavformat/vocdec.c |   29 ++++++++++++++++-------------
 libavformat/vocenc.c |    2 +-
 2 files changed, 17 insertions(+), 14 deletions(-)

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