SCSI ips: handle scsi_add_host() failure, and other err cleanups

commit 2551a13e

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: Mark Salyzyn <mark_salyzyn@adaptec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

FUJITA Tomonori notes:
  It didn't intend to fix a critical bug, however, it turned out that it
  does. Without this patch, the ips driver in 2.6.23 and 2.6.24 doesn't
  work at all. You can find the more details at the following thread:

  http://marc.info/?t=120293911900023&r=1&w=2



Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>