btrfs: no need to check for btrfs_fs_devices::seeding

There is no need to check for btrfs_fs_devices::seeding when we
have checked for btrfs_fs_devices::opened, because we can't sprout
without its seed FS being opened.
Signed-off-by: NAnand Jain <anand.jain@oracle.com>
Reviewed-by: NJosef Bacik <jbacik@fb.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/volumes.c

@@ -618,8 +618,6 @@ static void btrfs_free_stale_device(struct btrfs_device *cur_dev)
 
 		if (fs_devs->opened)
 			continue;
-		if (fs_devs->seeding)
-			continue;
 
 		list_for_each_entry(dev, &fs_devs->devices, dev_list) {