- kill pointless irq handler loop to find base address, it is already
  passed to irq handler via Scsi_Host.

- kill now-pointless !base test.
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>