usb: ehci: Use endpoint in URB to get maxpacket

usb_maxpacket() looks up the endpoint number in the pipe which can fail
if the interface or configuration changes before the routine is called.
This is unexpected and may even cause a modulo by zero afterwards.

So use usb_endpoint_maxp() routine which uses the endpoint stored in URB
to get the maxpacket.
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Khalid Masum <khalid.masum.92@gmail.com>
Addresses-Coverity: 744857 ("Division or modulo by zero")
Addresses-Coverity: 1487371 ("Division or modulo by zero")
Link: https://lore.kernel.org/r/20220824193813.13129-1-khalid.masum.92@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-q.c

@@ -645,7 +645,7 @@ qh_urb_transaction (
 		token |= (1 /* "in" */ << 8);
 	/* else it's already initted to "out" pid (0 << 8) */
 
-	maxpacket = usb_maxpacket(urb->dev, urb->pipe);
+	maxpacket = usb_endpoint_maxp(&urb->ep->desc);
 
 	/*
 	 * buffer gets wrapped in one or more qtds;
@@ -1218,7 +1218,7 @@ static int ehci_submit_single_step_set_feature(
 
 	token |= (1 /* "in" */ << 8);  /*This is IN stage*/
 
-	maxpacket = usb_maxpacket(urb->dev, urb->pipe);
+	maxpacket = usb_endpoint_maxp(&urb->ep->desc);
 
 	qtd_fill(ehci, qtd, buf, len, token, maxpacket);