block/rnbd: Kill rnbd_clt_destroy_default_group

No need to have it since we can call sysfs_remove_group in the
rnbd_clt_destroy_sysfs_files.

Then rnbd_clt_destroy_sysfs_files is paired with it's counterpart
rnbd_clt_create_sysfs_files.

Signed-off-by: Guoqing Jiang <guoqing.jiang@ionos.com>
Reviewed-by: Danil Kipnis <danil.kipnis@ionos.com>
Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210419073722.15351-7-gi-oh.kim@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/rnbd/rnbd-clt-sysfs.c

@@ -639,13 +639,9 @@ int rnbd_clt_create_sysfs_files(void)
 	return err;
 }
 
-void rnbd_clt_destroy_default_group(void)
-{
-	sysfs_remove_group(&rnbd_dev->kobj, &default_attr_group);
-}
-
 void rnbd_clt_destroy_sysfs_files(void)
 {
+	sysfs_remove_group(&rnbd_dev->kobj, &default_attr_group);
 	kobject_del(rnbd_devs_kobj);
 	kobject_put(rnbd_devs_kobj);
 	device_destroy(rnbd_dev_class, MKDEV(0, 0));

drivers/block/rnbd/rnbd-clt.c

@@ -1675,7 +1675,6 @@ static void rnbd_destroy_sessions(void)
 	struct rnbd_clt_dev *dev, *tn;
 
 	/* Firstly forbid access through sysfs interface */
-	rnbd_clt_destroy_default_group();
 	rnbd_clt_destroy_sysfs_files();
 
 	/*

drivers/block/rnbd/rnbd-clt.h

@@ -159,7 +159,6 @@ int rnbd_clt_resize_disk(struct rnbd_clt_dev *dev, size_t newsize);
 int rnbd_clt_create_sysfs_files(void);
 
 void rnbd_clt_destroy_sysfs_files(void);
-void rnbd_clt_destroy_default_group(void);
 
 void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev);