usb: cdnsp: Fixes error: uninitialized symbol 'len'

The patch 5bc38d3: "usb: cdnsp: Fixes issue with redundant
Status Stage" leads to the following Smatch static checker warning:

  drivers/usb/cdns3/cdnsp-ep0.c:470 cdnsp_setup_analyze()
  error: uninitialized symbol 'len'.

cc: <[email protected]>
Fixes: 5bc38d3 ("usb: cdnsp: Fixes issue with redundant Status Stage")
Signed-off-by: Pawel Laszczak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: pawellcdns

drivers/usb/cdns3/cdnsp-ep0.c

@@ -414,7 +414,7 @@ static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,
 void cdnsp_setup_analyze(struct cdnsp_device *pdev)
 {
 	struct usb_ctrlrequest *ctrl = &pdev->setup;
-	int ret = 0;
+	int ret = -EINVAL;
 	u16 len;
 
 	trace_cdnsp_ctrl_req(ctrl);
@@ -424,7 +424,6 @@ void cdnsp_setup_analyze(struct cdnsp_device *pdev)
 
 	if (pdev->gadget.state == USB_STATE_NOTATTACHED) {
 		dev_err(pdev->dev, "ERR: Setup detected in unattached state\n");
-		ret = -EINVAL;
 		goto out;
 	}