spi: rockchip-sfc: Fix error in remove progress

Fix error in remove progress:
	[   43.026148] Call trace:
	[   43.026370]  klist_next+0x1c/0x1d4
	[   43.026671]  device_for_each_child+0x48/0xac
	[   43.027049]  spi_unregister_controller+0x30/0x130
	[   43.027469]  rockchip_sfc_remove+0x48/0x80 [spi_rockchip_sfc]

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://patch.msgid.link/20241218154741.901591-1-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Jon Lin

drivers/spi/spi-rockchip-sfc.c

@@ -182,6 +182,7 @@ struct rockchip_sfc {
 	bool use_dma;
 	u32 max_iosize;
 	u16 version;
+	struct spi_controller *host;
 };
 
 static int rockchip_sfc_reset(struct rockchip_sfc *sfc)
@@ -574,6 +575,7 @@ static int rockchip_sfc_probe(struct platform_device *pdev)
 
 	sfc = spi_controller_get_devdata(host);
 	sfc->dev = dev;
+	sfc->host = host;
 
 	sfc->regbase = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(sfc->regbase))
@@ -651,8 +653,8 @@ static int rockchip_sfc_probe(struct platform_device *pdev)
 
 static void rockchip_sfc_remove(struct platform_device *pdev)
 {
-	struct spi_controller *host = platform_get_drvdata(pdev);
 	struct rockchip_sfc *sfc = platform_get_drvdata(pdev);
+	struct spi_controller *host = sfc->host;
 
 	spi_unregister_controller(host);