USB: Fix priority mistakes in drivers/usb/core/hub.c

Fixes priority mistakes similar to '!x & y'

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>