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Actual users of ub quickly found problems, so here's a patch to address
some of them.

#1: An attempt to mount a CF card, pull the plug, then unmount causes a
message "getblk: bad sector size 512" and an oops. This is caused by
trying to do put_disk from disconnect instead of using a reference count.
The sd.c does it this way (it uses kref).

#2: The hald fills /var/log/messages with block device errors. It seems
that it happens because ub allowed opens of known offline devices, and
then partition checking produced those errors. I hope taking code from
sd.c should fix it.

Also I replaced usb_unlink_urb with usb_kill_urb.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>