Remove unused local `us', which broke the build.  Also nuke an unneeded
cast.
Repairs commit 
191648d03d20 ("usb: storage: Convert US_DEBUGP to
usb_stor_dbg").
Cc: Joe Perches <joe@perches.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 
 
 static void realtek_cr_destructor(void *extra)
 {
-       struct rts51x_chip *chip = (struct rts51x_chip *)extra;
-       struct us_data *us;
+       struct rts51x_chip *chip = extra;
 
        if (!chip)
                return;
 
-       us = chip->us;
-
 #ifdef CONFIG_REALTEK_AUTOPM
        if (ss_en) {
                del_timer(&chip->rts51x_suspend_timer);