[SCSI] drivers/scsi/dpt_i2o.c: cleanup useless code

This patch removes the array 'hbas' as it seems to be useless
and redundant with the linked list hbas_chain.

Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>