btrfs: quota: Set rescan progress to (u64)-1 if we hit last leaf

Commit ff3d27a0 ("btrfs: qgroup: Finish rescan when hit the last leaf
of extent tree") added a new exit for rescan finish.

However after finishing quota rescan, we set
fs_info->qgroup_rescan_progress to (u64)-1 before we exit through the
original exit path.
While we missed that assignment of (u64)-1 in the new exit path.

The end result is, the quota status item doesn't have the same value.
(-1 vs the last bytenr + 1)
Although it doesn't affect quota accounting, it's still better to keep
the original behavior.
Reported-by: NMisono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Fixes: ff3d27a0 ("btrfs: qgroup: Finish rescan when hit the last leaf of extent tree")
Signed-off-by: NQu Wenruo <wqu@suse.com>
Reviewed-by: NMisono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/qgroup.c

@@ -2680,8 +2680,10 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
 		free_extent_buffer(scratch_leaf);
 	}
 
-	if (done && !ret)
+	if (done && !ret) {
 		ret = 1;
+		fs_info->qgroup_rescan_progress.objectid = (u64)-1;
+	}
 	return ret;
 }