usb: cdnsp: Fix lack of removing request from pending list.

Patch fixes lack of removing request from ep->pending_list on failure
of the stop endpoint command. Driver even after failing this command
must remove request from ep->pending_list.
Without this fix driver can stuck in cdnsp_gadget_ep_disable function
in loop:
while (!list_empty(&pep->pending_list)) {
preq = next_request(&pep->pending_list);
cdnsp_ep_dequeue(pep, preq);
}

Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Signed-off-by: Pawel Laszczak <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Peter Chen <[e-mail]>

drivers/usb/cdns3/cdnsp-gadget.c

···
 int cdnsp_ep_dequeue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
 {
 	struct cdnsp_device *pdev = pep->pdev;
-	int ret;
+	int ret_stop = 0;
+	int ret_rem;
 
 	trace_cdnsp_request_dequeue(preq);
 
-	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_RUNNING) {
-		ret = cdnsp_cmd_stop_ep(pdev, pep);
-		if (ret)
-			return ret;
-	}
+	if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_RUNNING)
+		ret_stop = cdnsp_cmd_stop_ep(pdev, pep);
 
-	return cdnsp_remove_request(pdev, preq, pep);
+	ret_rem = cdnsp_remove_request(pdev, preq, pep);
+
+	return ret_rem ? ret_rem : ret_stop;
 }
 
 static void cdnsp_zero_in_ctx(struct cdnsp_device *pdev)