usb: cdns3: remove redundant assignment to pointer trb

Pointer trb being assigned with a value that is never read, it is
assigned a new value later on. The assignment is redundant and
can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200208161802.28846-1-colin.king@canonical.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/cdns3/gadget.c

@@ -1380,7 +1380,7 @@ static bool cdns3_request_handled(struct cdns3_endpoint *priv_ep,
 				  struct cdns3_request *priv_req)
 {
 	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
-	struct cdns3_trb *trb = priv_req->trb;
+	struct cdns3_trb *trb;
 	int current_index = 0;
 	int handled = 0;
 	int doorbell;