usb: core: fix compile warning

Fix the following compile warning:

warning: unused variable ‘flags’ [-Wunused-variable]
  unsigned long flags;

Fixes: ed194d136769 ("usb: core: remove local_irq_save() around ->complete() handler")
Signed-off-by: Gustavo A. R. Silva <redacted>
---
 drivers/usb/core/hcd.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index f985d23..487025d 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c

@@ -1738,7 +1738,6 @@ static void __usb_hcd_giveback_urb(struct urb *urb)
 	struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
 	struct usb_anchor *anchor = urb->anchor;
 	int status = urb->unlinked;
-	unsigned long flags;
 
 	urb->hcpriv = NULL;
 	if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&