drivers/spi-rockchip.c : Remove redundant variable slave

variable slave in spi_alloc_master() or spi_alloc_slave()
has been assigned. it is not necessary to be assigned again

Signed-off-by: Lizhe <sensor1010@163.com>
Link: https://lore.kernel.org/r/20230226063334.7489-1-sensor1010@163.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-rockchip.c

@@ -772,7 +772,6 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, ctlr);
 
 	rs = spi_controller_get_devdata(ctlr);
-	ctlr->slave = slave_mode;
 
 	/* Get basic io resource and map it */
 	rs->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);