mmc: test: remove the shutdown function

Since it's doing nothing for shutdown behavior. And the callback will
be checked firstly in mmc_bus_shutdown().

Signed-off-by: Yue Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Yue Hu

drivers/mmc/core/mmc_test.c

@@ -3267,17 +3267,12 @@ static void mmc_test_remove(struct mmc_card *card)
 	mmc_test_free_dbgfs_file(card);
 }
 
-static void mmc_test_shutdown(struct mmc_card *card)
-{
-}
-
 static struct mmc_driver mmc_driver = {
 	.drv		= {
 		.name	= "mmc_test",
 	},
 	.probe		= mmc_test_probe,
 	.remove		= mmc_test_remove,
-	.shutdown	= mmc_test_shutdown,
 };
 
 static int __init mmc_test_init(void)