partitions: aix.c: off by one bug

The lvip[] array has "state->limit" elements so the condition here
should be >= instead of >.

Fixes: 6ceea22b

 ('partitions: add aix lvm partition support files')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Jens Axboe <axboe@fb.com>