audio: fix AVFrame allocation (crash with opus encoding)

AVFrame doesn't have public code for pool allocation, so mpv does it
manually. AVFrame allocation is very tricky, so we added a bug.

This crashed with libopus encoding, but not some other audio codecs,
because the libopus libavcodec wrapper accesses AVFrame.data. Most code
tries to avoid accessing AVFrame.data and uses AVFrame.extended_data,
because using the former would subtly corrupt memory on more than 8
channels. The fact that this problem manifested only now shows that most
AVFrame consuming FFmpeg code indeed uses extended_data for audio.

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