spi: clean up some inconsistent indenting

Eliminate the follow smatch warning:
drivers/spi/spi-sunplus-sp7021.c:379 sp7021_spi_slave_transfer_one()
warn: inconsistent indenting
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NYang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220217010024.111904-1-yang.lee@linux.alibaba.comSigned-off-by: NMark Brown <broonie@kernel.org>