staging:iio:accel:sca3000 drop some unused variables.

 * struct sca3000_state - device instance state information

 * @us:			the associated spi device

 * @info:			chip variant information

 * @interrupt_handler_ws:	event interrupt handler for all events

 * @last_timestamp:		the timestamp of the last event

 * @mo_det_use_count:		reference counter for the motion detection unit

 * @lock:			lock used to protect elements of sca3000_state

 *				and the underlying device state.

 * @bpse:			number of bits per scan element

 * @tx:			dma-able transmit buffer

 * @rx:			dma-able receive buffer

 **/

struct sca3000_state {

	struct spi_device		*us;

	const struct sca3000_chip_info	*info;

	struct work_struct		interrupt_handler_ws;

	s64				last_timestamp;

	int				mo_det_use_count;

	struct mutex			lock;

	int				bpse;

	/* Can these share a cacheline ? */

	u8				rx[384] ____cacheline_aligned;

	u8				tx[6] ____cacheline_aligned;

		goto error_ret;

	ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,

				(st->rx[0] & SCA3000_MODE_PROT_MASK));

	st->bpse = 11;

error_ret:

	mutex_unlock(&st->lock);