xhci: Add debugging for URB link failure.

Occasionally after a cold boot and an unload and reload of the xHCI
driver, when I plug in a UAS device and streams are allocated, I see
that the first URB it submits continually gets an error code from
usb_submit_urb().  I think I've tracked it down to
usb_hcd_link_urb_to_ep(), but I need to know *why* that's failing.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
1 file changed