mmc: meson-mx-sdhc: Avoid cast to incompatible function type

Rather than casting mmc_free_host to an incompatible function type,
provide a trivial wrapper with the correct signature for the use-case.

Reported by clang-16 with W=1:

 .../meson-mx-sdhc-mmc.c:791:38: error: cast from 'void (*)(struct mmc_host *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
         ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ./include/linux/device.h:265:38: note: expanded from macro 'devm_add_action_or_reset'
         __devm_add_action_or_reset(release, action, data, #action)
                                            ^~~~~~

The same approach is taken in litex_mmc.c with the function
litex_mmc_free_host_wrapper(). There may be scope for consolidation.

No functional change intended.
Compile tested only.
Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20230510-mmc-sdhci-msm-function-cast-v1-1-5ae634b24fbd@kernel.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/meson-mx-sdhc-mmc.c

@@ -776,6 +776,11 @@ static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
 	regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
 }
 
+static void meason_mx_mmc_free_host(void *data)
+{
+       mmc_free_host(data);
+}
+
 static int meson_mx_sdhc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -788,8 +793,7 @@ static int meson_mx_sdhc_probe(struct platform_device *pdev)
 	if (!mmc)
 		return -ENOMEM;
 
-	ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
-				       mmc);
+	ret = devm_add_action_or_reset(dev, meason_mx_mmc_free_host, mmc);
 	if (ret) {
 		dev_err(dev, "Failed to register mmc_free_host action\n");
 		return ret;