spi: spi.c: White-space fix in __spi_pump_messages()

Reported-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: David Jander <david@protonic.nl>
Link: https://lore.kernel.org/r/20220629142519.3985486-2-david@protonic.nl


Signed-off-by: Mark Brown <broonie@kernel.org>