btrfs: make btrfs_free_stale_devices() argument optional
This updates btrfs_free_stale_devices() helper function to delete all unmouted devices, when arg is NULL. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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