mmc: sdhci-s3c: constify uses of driver/match data

The driver data (struct sdhci_s3c_drv_data) stored in of_device_id
table is allocated as const and used only in const-way. Skip
unnecessary const-away casts and convert all users to work with pointer
to const. This is both more logical and safer.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Sylwester Nawrocki <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/sdhci-s3c.c

···
 }
 #endif
 
-static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
+static inline const struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
 			struct platform_device *pdev)
 {
 #ifdef CONFIG_OF
 	if (pdev->dev.of_node)
-		return (struct sdhci_s3c_drv_data *)of_device_get_match_data(&pdev->dev);
+		return of_device_get_match_data(&pdev->dev);
 #endif
-	return (struct sdhci_s3c_drv_data *)
+	return (const struct sdhci_s3c_drv_data *)
 			platform_get_device_id(pdev)->driver_data;
 }
 
 static int sdhci_s3c_probe(struct platform_device *pdev)
 {
 	struct s3c_sdhci_platdata *pdata;
-	struct sdhci_s3c_drv_data *drv_data;
+	const struct sdhci_s3c_drv_data *drv_data;
 	struct device *dev = &pdev->dev;
 	struct sdhci_host *host;
 	struct sdhci_s3c *sc;
···
 MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);
 
 #ifdef CONFIG_OF
-static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
+static const struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
 	.no_divider = true,
 };