btrfs: sysfs, rename devices kobject holder to devices_kobj
The struct member btrfs_device::device_dir_kobj holds the kobj of the sysfs directory /sys/fs/btrfs/UUID/devices, so rename it from device_dir_kobj to devices_kobj. No functional changes. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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