btrfs: sysfs, rename btrfs_sysfs_add_device()

btrfs_sysfs_add_device() creates the directory
/sys/fs/btrfs/UUID/devices but its function name is misleading. Rename
it to btrfs_sysfs_add_devices_kobj() instead. No functional changes.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -3089,7 +3089,7 @@ int __cold open_ctree(struct super_block *sb,
 		goto fail_block_groups;
 	}
 
-	ret = btrfs_sysfs_add_device(fs_devices);
+	ret = btrfs_sysfs_add_devices_kobj(fs_devices);
 	if (ret) {
 		btrfs_err(fs_info, "failed to init sysfs device interface: %d",
 				ret);

fs/btrfs/sysfs.c

@@ -995,7 +995,7 @@ int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
 	return 0;
 }
 
-int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
+int btrfs_sysfs_add_devices_kobj(struct btrfs_fs_devices *fs_devs)
 {
 	if (!fs_devs->devices_kobj)
 		fs_devs->devices_kobj = kobject_create_and_add("devices",