mdadm: put journal device in right place of --detail

mdadm: put journal device in right place of --detail

When there is failed HDDs, journal device showed in wrong place
of --detail:

    Number   Major   Minor   RaidDevice State
       4       8       24        -      journal   /dev/sdb8
       1       8       18        1      active sync   /dev/sdb2
       2       8       19        2      active sync   /dev/sdb3
       3       8       21        3      active sync   /dev/sdb5

       0       8       17        -      faulty   /dev/sdb1

This patch fixed the output as:

    Number   Major   Minor   RaidDevice State
       -       0        0        0      removed
       1       8       18        1      active sync   /dev/sdb2
       2       8       19        2      active sync   /dev/sdb3
       3       8       21        3      active sync   /dev/sdb5

       0       8       17        -      faulty   /dev/sdb1
       4       8       24        -      journal   /dev/sdb8

Reported-by: Yi Zhang <yizhan@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>