spi: pxa2xx: pxa2xx_spi_transfer_one() can be static

Fixes: d5898e19 ("spi: pxa2xx: Use core message processing loop")
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pxa2xx.c

@@ -911,7 +911,7 @@ static bool pxa2xx_spi_can_dma(struct spi_controller *master,
 	       xfer->len >= chip->dma_burst_size;
 }
 
-int pxa2xx_spi_transfer_one(struct spi_controller *master,
+static int pxa2xx_spi_transfer_one(struct spi_controller *master,
 				   struct spi_device *spi,
 				   struct spi_transfer *transfer)
 {