Fixes sparse warnings of this kind:
drivers/spi/spi.c:117:16: sparse:     expected struct spi_statistics *
drivers/spi/spi.c:117:16: sparse:     got struct spi_statistics [noderef]
 __percpu *[assigned] pcpu_stats
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NDavid Jander <david@protonic.nl>
Link: https://lore.kernel.org/r/20220805084458.1602277-1-david@protonic.nlSigned-off-by: NMark Brown <broonie@kernel.org>