xfs_repair: catch bad level/depth in da node

xfs_repair: catch bad level/depth in da node

Two tests added some time ago to dir2.c:

44dae5e xfs_repair: test for bad level in dir2 node
28148f6 xfs_repair: catch bad depth in traverse_int_dir2block

never made it to the similar tree-walking code in attr_repair.c;
fix that up here.  The error string details will be fixed up
later.

Signed-off-by; Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>