Comment # 1 on bug 1042295 from Jiri Slaby

The fix is sitting in -next:
commit d3be974a9c4eac83c1af15c966857d123a8436ba
Author: Lu Baolu <baolu.lu@linux.intel.com>
Date:   Sat Jun 3 17:15:06 2017 +0800

    usb/early: Remove trace_printk() callers in xhci-dbc