mmc: sdhci-acpi: remove unused struct sdhci_host variable

It was never used and introduce a warning

drivers/mmc/host/sdhci-acpi.c: In function 'sdhci_acpi_sdio_probe_slot':
drivers/mmc/host/sdhci-acpi.c:297:21: warning: variable 'host' set but
not used [-Wunused-but-set-variable]
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-acpi.c

@@ -294,13 +294,10 @@ static int sdhci_acpi_sdio_probe_slot(struct platform_device *pdev,
 				      const char *hid, const char *uid)
 {
 	struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
-	struct sdhci_host *host;
 
 	if (!c || !c->host)
 		return 0;
 
-	host = c->host;
-
 	/* Platform specific code during sdio probe slot goes here */
 
 	return 0;