scsi: sd: Unregister device if device_add_disk() failed in sd_probe()

"if device_add() succeeds, you should call device_del() when you want to
get rid of it."

In sd_probe(), device_add_disk() fails when device_add() has already
succeeded, so change put_device() to device_unregister() to ensure device
resources are released.

Fixes: 2a7a891 ("scsi: sd: Add error handling support for add_disk()")
Signed-off-by: Li Nan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Bart Van Assche <[email protected]>
Reviewed-by: Yu Kuai <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Li Nan

drivers/scsi/sd.c

@@ -3920,7 +3920,7 @@ static int sd_probe(struct device *dev)
 
 	error = device_add_disk(dev, gd, NULL);
 	if (error) {
-		put_device(&sdkp->disk_dev);
+		device_unregister(&sdkp->disk_dev);
 		put_disk(gd);
 		goto out;
 	}