This undoes the put_disk patch I sent in before.

If I had been paying attention I would have seen that we call put_disk
from free_hba during driver unload.  That's the only time we want to
call it.  If it's called from deregister disk we may remove the
controller (cNd0) unintentionally.
Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>