staging: spmi: hisi-spmi-controller: Use proper format in call to dev_err()

The correct format string for a size_t argument should be %zu.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20200901035722.9324-1-yuehaibing@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>