spi: omap-100k: Clean the value of 'status' is not used

spi: omap-100k: Clean the value of 'status' is not used

An error code is set to 'status' before exiting list_for_each_entry()
loop, but the value of 'status' is not used as below:

  list_for_each_entry(t, &m->transfers, transfer_list) {
  	if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
  		status = -EINVAL;
  		break;
  	}
  	...
  }

  status = omap1_spi100k_setup_transfer(spi, NULL);

Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/1620629903-15493-3-git-send-email-f.fangjian@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>