e2fsck: only complain about no-checksum directory blocks once

e2fsck: only complain about no-checksum directory blocks once

If a directory block lacks space for a checksum and the user directs
e2fsck to fix the directory block (by rehashing it), don't complain a
second time about the checksum verification failure when we get to the
end of the directory block.

Also, don't complain about broken HTREE directories if we're already
planning to rebuild the HTREE directory.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>