staging: vt6656: vnt_int_start_interrupt remove spin lock.

This formed part of the legacy driver and potentially multi
users.

The driver now has only one user mac80211 remove this lock.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/871a78d4-6d3e-f34b-d0ae-6123803c6faf@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/int.c

@@ -26,16 +26,11 @@
 int vnt_int_start_interrupt(struct vnt_private *priv)
 {
 	int ret = 0;
-	unsigned long flags;
 
 	dev_dbg(&priv->usb->dev, "---->Interrupt Polling Thread\n");
 
-	spin_lock_irqsave(&priv->lock, flags);
-
 	ret = vnt_start_interrupt_urb(priv);
 
-	spin_unlock_irqrestore(&priv->lock, flags);
-
 	return ret;
 }