usbnet: correct speed testing

Allow for SS+ USB
Signed-off-by: NOliver Neukum <ONeukum@suse.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/usb/usbnet.c

@@ -356,6 +356,7 @@ void usbnet_update_max_qlen(struct usbnet *dev)
 		dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
 		break;
 	case USB_SPEED_SUPER:
+	case USB_SPEED_SUPER_PLUS:
 		/*
 		 * Not take default 5ms qlen for super speed HC to
 		 * save memory, and iperf tests show 2.5ms qlen can