mmc: rtsx_usb_sdmmc: Use devm_mmc_alloc_host() helper

Use new function devm_mmc_alloc_host() to simplify the code.

Reviewed-by: Huacai Chen <[e-mail]>
Signed-off-by: Binbin Zhou <[e-mail]>
Link: https://lore.kernel.org/r/c7[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/rtsx_usb_sdmmc.c

···
 
 	dev_dbg(&(pdev->dev), ": Realtek USB SD/MMC controller found\n");
 
-	mmc = mmc_alloc_host(sizeof(*host), &pdev->dev);
+	mmc = devm_mmc_alloc_host(&pdev->dev, sizeof(*host));
 	if (!mmc)
 		return -ENOMEM;
 
···
 #ifdef RTSX_USB_USE_LEDS_CLASS
 		led_classdev_unregister(&host->led);
 #endif
-		mmc_free_host(mmc);
 		pm_runtime_disable(&pdev->dev);
 		return ret;
 	}
···
 	led_classdev_unregister(&host->led);
 #endif
 
-	mmc_free_host(mmc);
 	pm_runtime_disable(&pdev->dev);
 	platform_set_drvdata(pdev, NULL);