repair: don't double check dir2 sf parent in phase 4

repair: don't double check dir2 sf parent in phase 4

The shortform parent ino verification code runs once in phase 3
(ino_discovery == true) and once in phase 4 (ino_discovery ==
false). This is unnecessary and leads to duplicate error messages if
repair replaces an invalid parent value with zero because zero is
still an invalid value. Skip the check in phase 4.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
[sandeen: add comments suggested by Darrick during review]
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>