spi: core: propagate return code of __spi_validate_bits_per_word()

Propagate the actual return code of __spi_validate_bits_per_word() in
spi_setup().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed