xfs_repair: ensure .. is set sanely when rebuilding dir

xfs_repair: ensure .. is set sanely when rebuilding dir

When we're rebuilding a directory, ensure that we reinitialize the
directory with a sane parent ('..') inode value.  If we don't, the
error return from xfs_dir_init() is ignored, and the rebuild process
becomes confused and leaves the directory corrupt.  If repair later
discovers that the rebuilt directory is an orphan, it'll try to attach
it to lost+found and abort on the corrupted directory.  Also fix
ignoring the return value of xfs_dir_init().

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>