xhci: Add completion code to the debug ouput of unhandled transfer events

Helps debugging to know the unhandled event type.
Also make the debug message grepable

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 067f18a..88da8d6 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2354,8 +2354,8 @@
 			status = 0;
 			break;
 		}
-		xhci_warn(xhci, "ERROR Unknown event condition, HC probably "
-				"busted\n");
+		xhci_warn(xhci, "ERROR Unknown event condition %u, HC probably busted\n",
+			  trb_comp_code);
 		goto cleanup;
 	}