Fix undefined behavior in VP9Decoder::decode()
#50
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In VP9Decoder::decode(), if vpx_codec_decode() fails and `private` is None, we attempt to construct a Box via Box::from_raw() from a NULL pointer, which is undefined behavior.
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In
VP9Decoder::decode(), ifvpx_codec_decode()fails andprivateisNone, we attempt to construct aBoxviaBox::from_raw()from a NULL pointer, which is undefined behavior.