mmc: mmc_test: Fix removal of debugfs file

In __mmc_test_register_dbgfs_file(), we need to assign 'file', as it's
being used when removing the debugfs files when the mmc_test module is
removed.

Fixes: a04c50a ("mmc: core: no need to check return value of debugfs_create functions")
Signed-off-by: Ye Bin <[email protected]>
Acked-by: Adrian Hunter <[email protected]>
Cc: [email protected]
[Ulf: Re-wrote the commit msg]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Ye Bin

drivers/mmc/core/mmc_test.c

@@ -3179,7 +3179,8 @@ static int __mmc_test_register_dbgfs_file(struct mmc_card *card,
 	struct mmc_test_dbgfs_file *df;
 
 	if (card->debugfs_root)
-		debugfs_create_file(name, mode, card->debugfs_root, card, fops);
+		file = debugfs_create_file(name, mode, card->debugfs_root,
+					   card, fops);
 
 	df = kmalloc(sizeof(*df), GFP_KERNEL);
 	if (!df) {