spi: fsl-espi: improve return value handling in fsl_espi_bufs

Return a proper status code from fsl_espi_bufs instead of returning
the number of remaining words and let the caller evaluate it.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed