(a) scsi_check_device_busy() is unused now, kill it.  Btw, although I
    love to see this this really means we need to imply a
    scsi_set_device_offline (or even better scsi_set_host_offline)
    in scsi_remove_host now..
(b) make shost_class static to scsi_sysfs.c, with the new device model
    changes no LLDD needs this anymore
(c) move private prototypes where they belong.

BTW, Mike, did I miss something or will your changes make every driver
converted to scsi_add_host & co OOPS on removal now?