usb: core: urb make use of usb_endpoint_maxp_mult

Since usb_endpoint_maxp now returns only lower 11 bits mult
calculation here isn't correct anymore and that breaks webcam
for me. Patch make use of usb_endpoint_maxp_mult instead of
direct calculation.

Fixes: abb62184 ("usb: ch9: make usb_endpoint_maxp() return
       only packet size")
Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/core/urb.c

@@ -407,11 +407,8 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 		}
 
 		/* "high bandwidth" mode, 1-3 packets/uframe? */
-		if (dev->speed == USB_SPEED_HIGH) {
-			int	mult = 1 + ((max >> 11) & 0x03);
-			max &= 0x07ff;
-			max *= mult;
-		}
+		if (dev->speed == USB_SPEED_HIGH)
+			max *= usb_endpoint_maxp_mult(&ep->desc);
 
 		if (urb->number_of_packets <= 0)
 			return -EINVAL;