static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio,
			   u64 rsb, int byte_index, unsigned int block_offset,
			   int neras)
static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_io *io,
			   struct dm_verity_fec_io *fio, u64 rsb, int byte_index,
			   unsigned int block_offset, int neras)