pvr2_channel_claim_stream
int pvr2_channel_claim_stream(struct pvr2_channel *,
pvr2_channel_claim_stream(&adap->channel, NULL);
ret = pvr2_channel_claim_stream(&adap->channel, &pvr->video_stream);
if ((ret = pvr2_channel_claim_stream(&fh->channel,
pvr2_channel_claim_stream(&fh->channel,NULL);