DATA RELOC tree should also never be empty.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=200407
Reported-by: Xu Wen <wen...@gatech.edu>
Signed-off-by: Qu Wenruo <w...@suse.com>
---
It's possible just fold this fix into commit "btrfs: tree-checker: Detect
invalid empty essential tree".

And for the test image, it can already be rejected by misc-next branch
by the enhanced dev-extent checker.
---
 fs/btrfs/tree-checker.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 4c82a628df85..db835635372f 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -504,7 +504,8 @@ static int check_leaf(struct btrfs_fs_info *fs_info, struct 
extent_buffer *leaf,
                    owner == BTRFS_CHUNK_TREE_OBJECTID ||
                    owner == BTRFS_EXTENT_TREE_OBJECTID ||
                    owner == BTRFS_DEV_TREE_OBJECTID ||
-                   owner == BTRFS_FS_TREE_OBJECTID) {
+                   owner == BTRFS_FS_TREE_OBJECTID ||
+                   owner == BTRFS_DATA_RELOC_TREE_OBJECTID) {
                        generic_err(fs_info, leaf, 0,
                        "invalid root, root %llu must never be empty",
                                    owner);
-- 
2.18.0

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