scsi: return blk_status_t from device handler ->prep_fn
Remove the last use of the old BLKPREP_* values, which get converted to BLK_STS_* later anyway. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NBart Van Assche <bvanassche@acm.org> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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