drivers/rnbd: restore sysfs interface to rnbd-client

Commit 137380c renamed 'rnbd-client' to 'rnbd_client', this changed
sysfs interface to /sys/devices/virtual/rnbd_client/ctl/map_device
from /sys/devices/virtual/rnbd-client/ctl/map_device.

CC: Ivan Orlov <[email protected]>
CC: "Md. Haris Iqbal" <[email protected]>
CC: Jack Wang <[email protected]>
Fixes: 137380c ("block/rnbd: make all 'class' structures const")
Signed-off-by: Li Zhijian <[email protected]>
Acked-by: Jack Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: zhijianli88

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

@@ -25,7 +25,7 @@
 
 static struct device *rnbd_dev;
 static const struct class rnbd_dev_class = {
-	.name = "rnbd_client",
+	.name = "rnbd-client",
 };
 static struct kobject *rnbd_devs_kobj;