usb: gadget: aspeed_udc: fix missing spin_unlock_irqrestore in ast_udc_ep_queue

ast_udc_ep_queue misses spin_unlock_irqrestore in an error path,
this patch fixes that.

Fixes: 055276c132 ("usb: gadget: add Aspeed ast2600 udc driver")
Reviewed-by: Neal Liu <neal_liu@aspeedtech.com>
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Link: https://lore.kernel.org/r/20220616133508.3655864-1-zhengbin13@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/aspeed_udc.c

@@ -665,7 +665,8 @@ static int ast_udc_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
 	if (ep->ep.desc == NULL) {
 		if ((req->req.dma % 4) != 0) {
 			dev_warn(dev, "EP0 req dma alignment error\n");
-			return -ESHUTDOWN;
+			rc = -ESHUTDOWN;
+			goto end;
 		}
 
 		ast_udc_ep0_queue(ep, req);