spi: rockchip: mark use_dma as bool

The driver data has a u32 field use_dma which is
only ever used as a boolean, so change its type
to reflect that.
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-rockchip.c

@@ -202,7 +202,7 @@ struct rockchip_spi {
 
 	bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
 
-	u32 use_dma;
+	bool use_dma;
 	struct sg_table tx_sg;
 	struct sg_table rx_sg;
 	struct rockchip_spi_dma_data dma_rx;
@@ -628,9 +628,9 @@ static int rockchip_spi_transfer_one(
 
 	/* we need prepare dma before spi was enabled */
 	if (master->can_dma && master->can_dma(master, spi, xfer))
-		rs->use_dma = 1;
+		rs->use_dma = true;
 	else
-		rs->use_dma = 0;
+		rs->use_dma = false;
 
 	rockchip_spi_config(rs);