v4l2allocator: Guaranty queued state integrety
Because of the buf in videobuf2, dqbuf may leave the DONE flag being, which would implied that the buffer is queued. As this has been broken for 4 years, simply guaranty the state flags integrity when doing qbuf/dqbuf. See https://patchwork.linuxtv.org/patch/23641/
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