From: "Kurtis D. Rader" <kdrader@us.ibm.com>

http://bugme.osdl.org/show_bug.cgi?id=1365

The digi_acceleport.c USB serial driver has a bogus "address of" operator
that results in BUGs.

The problem is that digi_wakeup_write_lock() takes a pointer to a struct
usb_serial_port.  However, what gets passed is a pointer to a pointer to a
struct usb_serial_port.