btrfs: Update existing btrfs_device for renaming device
When we scan devices in a multi-device filesystem, we memorize the original
name. If the device gets a new name, later scans don't update the
in-kernel structures related to it, and we're not able to mount the
filesystem.
This patch updates device name during scaning.
Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>